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22 октября 2024 06:52

Is grass a monocot or a dicot?

Monocots: Plants with a single cotyledon or seed leaf. Leaf blades usually have parallel venation. Monocots may be grouped as grasses, sedges, or lilies.

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20 октября 2024 14:38

How long does a migraine usually last?

Migraines are disabling headaches that most likely stem from problems with the nerves and blood vessels in the head. Migraine headaches typically last from 4-72 hours. They may occur as often as several times a week to only once a year. People who have migraines are called migraineurs.

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18 октября 2024 14:08

What animal can live after being frozen?

Wood Frogs Can Survive Being Frozen Solid, Over and Over. Every autumn, the sanest animals head south, fleeing the encroaching winter lest they freeze to death or get torn apart by yetis.

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16 октября 2024 00:24

What magnification do you need to see bacteria?

At 400x magnification you will be able to see bacteria, blood cells and protozoans swimming around. At 1000x magnification you will be able to see these same items, but you will be able to see them even closer up.

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14 октября 2024 01:51

How much does the temperature change with altitude?

Although the actual atmospheric lapse rate varies, under normal atmospheric conditions the average atmospheric lapse rate results in a temperature decrease of 6.4C°/km (3.5F°/1,000 ft) of altitude above ground level. The measurable lapse rate is affected by the moisture content of the air (humidity).

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12 октября 2024 04:29

Which is the largest carnivorous land animal?

Today's large carnivorous land mammals, including the record-setting polar bears—which usually weigh around half a ton but can grow to weigh nearly a ton, are threatened in part because of the energy intake-and-expenditure equation, Carbone told LiveScience.

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10 октября 2024 03:47

Do frogs have ears?

Frogs can hear both in the air and below water. They do not have external ears; the eardrums (tympanic membranes) are directly exposed or may be covered by a layer of skin and are visible as a circular area just behind the eye.

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08 октября 2024 04:41

Are genes located on chromosomes?

In genetics, a locus (plural loci) is the specific location of a gene, DNA sequence, or position on a chromosome. Each chromosome carries many genes; humans' estimated 'haploid' protein coding genes are 20,000-25,000, on the 23 different chromosomes.

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06 октября 2024 03:46

Which planet has the hottest surface temperature?

Venus, the second closest plant to the Sun, has the highest average temperatures of any planet in our Solar System, regularly reaching temperatures over 460°C. Venus is so hot because of its proximity to the Sun and its thick atmosphere.

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04 октября 2024 08:13

Can babies breathe through their mouths?

Newborns are "obligate nose breathers." This means they can't breathe through their mouths in the first few months of life. Because babies have small nasal passages, they sound stuffy when they breathe.

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01 октября 2024 07:45

Is blue eyes a mutation?

New research shows that people with blue eyes have a single, common ancestor. A team at the University of Copenhagen have tracked down a genetic mutation which took place 6-10,000 years ago and is the cause of the eye colour of all blue-eyed humans alive on the planet today.

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30 сентября 2024 10:09

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29 сентября 2024 09:43

Do starfish have a brain?

The nervous system of the starfish is very simple...there is no brain and there are not even any ganglia to coordinate movement. The nervous system is characterized by a nerve ring that surrounds the mouth. A radial nerve branches off of the nerve ring and extends to each arm.

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27 сентября 2024 07:02

Do sea otters have pockets?

Under each foreleg, the sea otter has a loose pouch of skin that extends across the chest. In this pouch (preferentially the left one), the animal stores collected food to bring to the surface. This pouch also holds a rock, unique to the otter, that is used to break open shellfish and clams.

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22 сентября 2024 09:16

What causes dimples in the cheeks?

Dimples are caused by an abnormally short facial muscle. The zygomaticus major, a facial muscle, is attached to the skin of your cheeks. Dimples appear when the muscle pulls hard enough on your cheeks to cause visible indentations on your face. This usually occurs when we speak or smile, when the muscle is contracting.

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21 октября 2024 03:54

When was glass first made?

Archaeologists have found evidence of man-made glass which dates back to 4000 BC; this took the form of glazes used for coating stone beads. It was not until 1500 BC that the first hollow glass container was made by covering a sand core with a layer of molten glass.

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19 октября 2024 03:01

What part of the plant is a carrot?

When we eat corn or peas we are eating seeds, and when we eat radish or carrot, we are eating roots. Cauliflower and broccoli plants produce flowers we like to eat. Potatoes grow under- ground, but the part we eat is not a root.

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17 октября 2024 01:13

Why does water bubble when it boils?

The solubility of gases decreases when the temperature is raised, and that why the dissolved air bubbles out from the water. Then, as the boiling point of water is reached (100 degrees Celsius or 212 degrees Fahrenheit), water vapor starts to form inside the liquid in the form of bubbles.

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15 октября 2024 02:12

Which sea on the Earth has no beaches?

The Sargasso Sea, The Sea Without A Shore. The Sargasso Sea is located in the middle of the Atlantic Ocean, just a little north of the equator. The water in the Sargasso Sea is one of the clearest in the ocean, with underwater visibility of up to and incredible 200 feet.

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13 октября 2024 03:52

What time period are we in?

In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age and shorter than a period. We are currently living in the Holocene Epoch of the Quaternary Period. Rock layers deposited during an epoch are called a series.

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11 октября 2024 04:27

Who first proposed the theory of evolution by natural selection?

In the early 19th century, Jean-Baptiste Lamarck proposed his theory of the transmutation of species, the first fully formed theory of evolution. In 1858, Charles Darwin and Alfred Russel Wallace published a new evolutionary theory that was explained in detail in Darwin's On the Origin of Species (1859).

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09 октября 2024 00:56

Who was the designer of the Olympic rings?

The primary symbol of the Olympic Games is composed of five interlocking rings, colored blue, yellow, black, green, and red on a white field, known as the "Olympic rings." The symbol was originally designed in 1912 by Baron Pierre de Coubertin, co-founder of the modern Olympic Games.

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07 октября 2024 05:39

How many moons does Mars have?

Mars has two moons, Phobos and Deimos, which are thought to be captured asteroids. Both satellites were discovered in 1877 by Asaph Hall and are named after the characters Phobos (panic/fear) and Deimos (terror/dread) who, in Greek mythology, accompanied their father Ares, god of war, into battle.

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05 октября 2024 02:37

What countries border the Black Sea?

The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and the country of Turkey. It's bordered by Turkey, and by the countries of Bulgaria, Romania, Ukraine, Russia and Georgia.

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03 октября 2024 03:55

Can you go blind from looking at a solar eclipse?

While it may be tempting to brush off warnings against looking up at this eclipse bare-eyed, don't: The light of an eclipse really can damage your eyes — though warnings of total blindness are likely overstated. The condition is called solar retinopathy, and it occurs when bright light from the sun floods the retina.

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30 сентября 2024 10:11

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30 сентября 2024 10:07

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28 сентября 2024 07:55

What gland is responsible for regulating metabolism?

The thyroid gland regulates the body's metabolism, while parathyroid glands regulate calcium levels and have no effect on metabolism.

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26 сентября 2024 06:18

How many bones does a horse have?

Generally, the horse has 205 bones (54 vertebral column, 36 ribs, 1 sternum, 34 skull, 40 front legs, 40 hindlegs). The number of tail coccygeal vertebrae is usually 18 but can also vary.

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21 сентября 2024 05:54

Who discovered the vaccine for polio?

Jonas Salk. Jonas Edward Salk (October 28, 1914 – June 23, 1995) was an American medical researcher and virologist. He discovered and developed the first successful inactivated polio vaccine. He was born in New York City to Jewish parents.

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