Which is not an echinoderm?

A.)starfish
B.)sea urchin
C.)squid
D.)sand dollar

Answer:

When temperature and wind speed are constant, but humidity increases, the rate of evaporation will decrease. When wind speed and humidity stay constant, and temperature increases, then the rate of evaporation will increase because warmer air can hold more water vapor than colder air.

Answer:

if the rate of evaporation reduces water cylcle will stops and amount of water present in the world will be increase.humifity will be more.

Answer:

Natural immunization

Explanation:

Answer:

The S phase and prophase

Explanation:

Replication: it occurs in the S phase of the cecular cycle and the condensation of the chromosomes, the phase is M.

Answer:

DNA replicates before a cell divides to give a complete set of genetic instructions to each daughter cell.

Explanation:

Answer:

B: student B

C: He must have either the same mass or the gravity must be equal to [M(a)xG(a)]/M(b)= (25 x 10)/30=250/30=8.33

Answer:

There is overall agreement that volcanic sulphate aerosols in the stratosphere can reduce solar radiation reaching the earth's surface for years, thereby reducing surface temperatures, affecting global circulation patterns and generally the global climate system.

Answer:

B. 25%

Explanation:

There are 3 out of 4 chances the flower will be white because the white is a dominant trait, this leaves 1 out 4 chances for the flower to be purple.

Note: Drawing punnet squares can help you find the possible genotypes.

Answer: You might experience cold/winter weather because

Explanation: Atlantic ocean is pretty cold and as cold air rise up in the air making the atmospher kinda cold even when its near the equator.... because you are on a ship and you will only feel cold weather.

Answer:

The onerous elements of organisms, like bones, shells, and teeth have a far better likelihood of changing into fossils than do softer elements. One reason for this can be that scavengers typically don't eat these elements. onerous elements conjointly decay additional slowly than soft elements, giving longer for them to be buried.

Explanation:

Answer:

I think this is right

Explanation:

ocean warming evidence - melting of glaciers and ice caps, expansion of ocean volume, organisms more prone to illness or difficult for some species to make shells or growing difficulty in absorbing carbon dioxide

ocean acidification evidence - growing difficulty in absorbing carbon dioxide,

large concentration carbonic acid, organisms more prone to illness or difficult for some species to make shells

Answer:

I think this is right

Explanation:

ocean warming evidence - melting of glaciers and ice caps, expansion of ocean volume, organisms more prone to illness or difficult for some species to make shells or growing difficulty in absorbing carbon dioxide

ocean acidification evidence - growing difficulty in absorbing carbon dioxide,

large concentration carbonic acid, organisms more prone to illness or difficult for some species to make shells

Explanation:

b

Answer:

D. Meiosis forms four cells all with different genetic material

Explanation:

They are haploid cells and each cell only had one set of chromosomes. Meiosis results in variation.

Answer:

Phonograph

Explanation:

A phonograph, in its later forms also called a gramophone or since the 1940s called a record player, is a device for the mechanical recording and reproduction of sound

Answer:

Organs which need alot of energy to function properly have a greater number of mitochondria

Explanation:

Mitochondria are sites for respiratory enzymes which yield energy for the cells thus skeletal muscles which need alot of energy have more mitochondria than liver and liver due to doing more activities than skin has more mitochondria than the skin.

Answer:

Skeletal muscle cells have a very high amount of mitochondria as well as liver cells because they need high amounts of energy to carry out their functions, whereas skin cells don't need high amounts of energy to function.

The phase of mitosis which is shown in the picture is Metaphase. Thus, the correct option is A.

Mitosis may be defined as the type of cell division in which two daughter cells are formed from a parental cell with the exact number of chromosomes.

In metaphase, the chromosome usually lines up in one plane and forms an equatorial plate in which they are attached to the spindle fiber through their centromere.

Therefore, the phase of mitosis which is shown in the picture is Metaphase. Thus, the correct option is A.

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Answer:

In nature, populations are usually evolving. The grass in an open meadow, the wolves in a forest, and even the bacteria in a person's body are all natural populations. And all of these populations are likely to be evolving for at least some of their genes. Evolution is happening right here, right now!

To be clear, that doesn't mean these populations are marching towards some final state of perfection. All evolution means is that a population is changing in its genetic makeup over generations. And the changes may be subtle—for instance, in a wolf population, there might be a shift in the frequency of a gene variant for black rather than gray fur. Sometimes, this type of change is due to natural selection. Other times, it comes from migration of new organisms into the population, or from random events—the evolutionary "luck of the draw."

I hope this helps a little bit.

Answer:

Once an organism is beyond a certain size, it cannot get essential molecules into and out of cells solely by diffusion. Diffusion is limited by the surface area to volume ratio of the organism.

Explanation:

once an organism is beyond a certain size, it cannot get essential molecules into and out of cells solely by diffusion. diffusion is limited by the surface area to volume ratio of the organism.

Primary succession occurs after the occurrence of a severe event that leaves nothing but rocky surfaces. Option B. Lichens will grow on the cooled lava.

The succession term refers to colonization and subsequent changes.

Colonization has been defined as the sequence of events that conduce to the establishment of individuals, populations, species, or bigger groups in areas where they were absent before.

Succession refers to changes produced in the composition and structure of communities after a perturbation. There are different grades of succession according to the perturbation intensity.

In primary succession, the perturbation is so intense that it eliminates all the life forms in the area.

It is the sequence of species appearance in an exposed area that has not been influenced by any other species or community before.

In these cases, the rock gets exposed but it can not be colonized directly. The new area needs to suffer erosion and different chemical and physical processes that fragment, degrade and dissolve the rock to make colonization possible.

Primary succession occurs after severe events affecting a region, such as a retreating glacier, a volcanic activity, or an intense fire that leave nothing but the exposed rock.

After the disturbance, the order of the living beings establishment depends on the strategies of each of the species to survive.

First, pioneer species arrive. These are the first inhabitants, mostly lichens or plants with the capability of surviving in such an environment. Only a few pioneers can establish in the open space.

Pioneers modify the habitat. They make it more suitable for the posterior establishment of later species, converting rock into fertile soil. As conditions get better, new species arrive like grasses.

Grasses and pioneers keep modifying the ground and making it better with time.

Habitat modification keeps on going while new species establish. They produce shadows and alter the temperature, and humidity, fertilizing the soil.

Competition becomes more frequent between species. The first species are eventually eliminated by competition, while new species keep appearing and competing for resources.

This sequence continues until there is no more facilitation, and the communities reache a climax, becoming stable and lasting for hundreds of years until another disturbance occurs.

In the exposed example, the severe event affecting the Hawaii's Big Island was a volcanoe eruption.

The most likely event observed first in the areas covered by lava would be Lichens will grow on the cooled lava. Option B

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Answer:

5

Explanation:

The object distance Is 20 I'm

The image distance is 6.666

Therefore the focal length can be calculated as follows

1/f = 1/20 + 1/6.66

= 6.66+20/133.2

= 26.66/133.2

1/f= 26.66/133.2

f = 133.2/26.66

= 4.99

= 5

Hence the focal length is 5

Answer:

its called the enzyme pectinase

Explanation:

it speeds up up the breakdown of pectin in fruits producing more juices

Answer:

answers are:

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Answer:

I think it will option C

hope it helps

Answer:

the first one

Explanation:

So the predicted offspring genotypes are 50% Hh and 50% hh

so there is a 50% chance that they will have no horns and and aa 50% chance that they wont

Answer:

High amounts of mitochondria are found in skeletal muscle cells, as well as liver cells. On the other hand, skin cells have a small amount of mitochondria.

Answer:

The correct anwser is D. Signals inside the spinal cord

Explanation:

hope this helps :)