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Nuetrik [128]
1 year ago
13

Polar bears and grizzly bears share a common ancestor (similar to you and your cousin sharing a grandparent); Describe some sele

ctive pressures that may have caused speciation between these two types of bears.
Biology
1 answer:
Natali5045456 [20]1 year ago
7 0
Lasting genetic similarities make the two bears biological sister species, more closely related to one another than to any others. ... But Ursus maritimus has also evolved to match its polar environment, growing a longer snout than brown bears' and larger, paddle-like paws, both of which aid polar bears in hunting seals.
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Which would most likely result if mitosis was not accompanied by cytoplasmic division?​
oksano4ka [1.4K]

Answer:

The cell would not split in two

Explanation:

Each daughter cell has the same number and kind of chromosomes as the parent nucleus If mitosis were not accompanied by cytoplasmic division, there would only be one cell with two identical nuclei because the division did not occur for there to be two different cells.

4 0
1 year ago
Brainlest!!!!!!
forsale [732]

answer mercury

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1 year ago
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The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three- chambered hea
Arisa [49]

Answer:

The four- chambered hearts of birds and mammals are best described as <u>homoplasies.</u>

Explanation:

In evolution, homoplasies are the trait shared in different species despite that their ancestors didn't have it at all.  In other words, these are traits that can be gained or lost during evolution in different lineages independently. For example, wings of birds and wings of bats do the same function (help in flying) but they were not there in the ancestors so both animals developed these structures independently.

In the given example, birds and mammals have four-chambered heart but their ancestors have 3 chamber hearts. They evolved independently and developed 4 chamber heart. This might be due to several reasons. However, their ancestors didn't have the feature so it is an example of homoplasy.

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1 year ago
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Alicia is being tickled by her older sister. which divisions of the nervous system are receiving the signals from her sister’s f
Finger [1]

In this case, when Alicia is being tickled  by her older sister, the divisions of the nervous system which are responsible for receiving the signals from her sister’s fingers are called somatosensory cortex and anterior cingulated cortex nervous system. 

When you are touched lightly, the effect of having that ticklish sensation is caused by the analysis of two regions of the brain. For example, when our brain analyses the pressure of the touch, this is the work of the somatosensory cortex. On the other hand, as soon as something touches your skin, the signal sent from the skin's sensory receptors also passes through the anterior cingulated cortex.<span>This is where the pleasant feelings are governed. </span>

6 0
2 years ago
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vladimir1956 [14]

      That's right, what really happens is that the cell needs a "trash can", just like we do, because sometimes, things can go wrong along the process.

      The processes that the lysosomes can be involved are quite a lot, but the main one is the protein making. Why? Well, it's simple, there's a chance of mistake in each part of a protein our cells make through all the process, and when this happens, the cell recognizes it before this protein goes outside the cell, after this recognition, some flags are put in it to mark it.

       This mark will work in a way that the protein will go into the lysosome, and in a lysosome, there are several kinds of enzymes, so this protein can be degrated into little components again, the amino acids, and these can be used again in the process of making a new one. This is the process of recycling the protein, whether it's a misfolded protein or even the ones that the body won't need it for now.

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