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Varvara68 [4.7K]
2 years ago
7

which of the follwing is evolutionary evidence that whales and dolphins descended from land dwelling mammals'

Biology
1 answer:
ivanzaharov [21]2 years ago
6 0

<u>Transition fossils show</u><u> the presence of leglike structures, pointing to the possibility that the ancestors of </u><u>whale</u><u> and dolphins once lived on land.</u>

  • The cetaceans, which include whales, dolphins, and porpoises, are descended from land-dwelling mammals.
  • Traces of their terrestrial ancestry can still be seen in the bones of their fins, which resemble enormous, jointed hands, in their vertical spine movement, and in the fact that they must breathe air from the surface.

What is evidence that whales evolved from land mammals?

  • There are several indications from a whale's anatomy and biology indicating they originated on land.
  • They have paddle-shaped flippers that house hand bones with five "fingers," breathe air, and nurse their young with their own milk.
  • Whales have tiny back limbs as embryos, but these vanish before birth.

Learn more about dwelling mammals  

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How does someone achieve a unified self?
lesantik [10]

Answer:

please mark me as brain list

Explanation:

The unified self is a flawed construct. Experience changes us, even at the core. People change us just by being with us. It doesn't have to be a long term relationship. Our minds may not have the plasticity they once had but we adapt daily to the people around us and, in a slower fashion, tide rather than waves rather than ripples, we the ebb and flow of experience changes the "I think" that creates our values and judgements, which changes the experiences we seek then have which again works on the way we view the world.

A possible reason we are able to change when we are with different types of people is that we have a certain number of roles at our disposal. I've noticed this, on an extreme level, with some coworkers. I wondered how they could change so much when they got to the office. They'd suddenly become very business-like and at first I thought they were play acting. They were, in a sense, but I believe their identity changed when they walked through the office door. They were no longer the guy or girl I'd just ridden to work with, they were such and such part of the hierarchy and their behavior wasn't all a put on, though some of everyone's behavior in every role is, it was who they were then.

It took being asked to take a work related personality test that clued me in. The test results came back. One part of results outlined our scores for introversion/extroversion scores at home and at work. The scale was -50 to +50 where the score determined one's level of introversion (-) or extraversion (+). I scored -33 at home and a +33 at work. The automatic scoring algorithm suggested that it was likely I was under a lot of internal stress because of this. I was. I used to have dry heaves when I transitioned from work to home. That part of the results wasn't the only part rang true though so I took it seriously.

How close the roles we play with different people are to each other might be an indicator of how unified we are. If you were to scale our unification factor from 0 to 1 I would have been considered a 0.33 based on my introversion/extraversion scores, if that was the only score that mattered. More things the behavior than others matters, of course. Perhaps people who are very different in differing situations experience more cognitive dissonance. It would be interesting knowing.

6 0
2 years ago
Your BFF is a red-headed, left-handed, blue-eyed girl. She finds out that you are taking Human Genetics and wants you to explain
Pavlova-9 [17]

Answer:

Red hair, left handed, and blue eyes are recessive traits.

Any trait has its two allele, dominant and recessive. Dominant trait allele if present with the recessive allele, then the phenotype will be of dominant allele.

Suppose A = dominant allele for brown color hair, a = recessive allele for red color hair.

As mentioned above red color hair is recessive in nature. for the recessive traits to show, the alleles should be recessive only.

Aa (brown hair) (parent 1) is crossed with Aa (parent 2) (brown hair). They both have gametes A and a.

Their children will have genotype AA, aa, and Aa. AA = brown color, aa = red color hair, and Aa= brown color hair.

Same case goes with the left hand and blue eyes traits.

So, the girl parents must be having recessive alleles for all the traits, and she must have inherited all the recessive allele only.

Explanation:

7 0
4 years ago
Read 2 more answers
Name the two different types of nucleic acids
stepladder [879]

Answer: RNA and DNA are the main ones, but mRNA and rRna are some, too

Explanation:

3 0
3 years ago
Draw and label nucleus, mitochondria, smooth er, rough er, lysosome, nucleolus, ribosome, chloroplast, central vacuole, vesicles
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Nucleus is the main component of the cell and carries out the vital processes of the cell.

  • For learning about its structure, a nucleus diagram is quite helpful. Important components of its structure include.
  • One feature of the nucleus that distinguishes eukaryotic cells from prokaryotic ones is the nuclear membrane.
  • Additionally, it has a double-layer structure. It also has phospholipids in it.
  • The nuclear envelope, nucleoplasm, or nucleus sap, nuclear matrix, chromatin, and nucleolus are some of the several structures that make up the nucleus.
  • The nuclear membrane, also referred to as the nuclear envelope, creates an envelope-like structure surrounding the nuclear contents.

learn more about Nucleus here:

brainly.com/question/804369

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4 0
2 years ago
How are humans a driving selection of tuskless elephants?
OverLord2011 [107]

Explanation: Elephants have been extensively hunted for ivory for more than 300 years, natural selection is often proposed as the underlying mechanism for an increase in the proportion of tuskless or small-tusked elephants in a population.

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