Propose an explanation for why there are no predominantly-aquatic marsupials while there are many aquatic placentals...

Propose an explanation for why there are no predominantly-aquatic marsupials while there are many aquatic placentals (seals, whales, manatees, etc.)

Solutions

Expert Solution

There are no predominantly-aquatic marsupials while there are many aquatic placentals (seals, whale, manatees ets.)

This is due to the reason that:

In placentals the foetus from its early development stage to a fully developed one is being carried inside the mother. So the foetus is protected completely from the outside environment.

For monotremes (platypus and echidna) they lay eggs in land, and hence are protected from the outer environment.

But in case of marsupials, the foetus from its early developmental stage crawls and gets attached to the teat that is located inside the pouch or the so called marsupium. If there existed predominantly aquatic-marsupials the, foetus in its early developmental stage that is being attached and held inside the pouch would be prone to water borne pathogens as well as the predators. In addition they would not posses fully developed respiratory organs. Such a foetus in any case would not be able to survive.

gladiator answered 1 year ago

Next > < Previous

Related Solutions

Propose a reasonable explanation for why soaps form scums with ions like Ca2+ but not with...

Propose a reasonable explanation for why soaps form scums with ions like Ca2+ but not with Na+. Support your explanation

Synthesis of soap from lipids lab 1. Propose a reasonable explanation for why soaps form scums...

Synthesis of soap from lipids lab 1. Propose a reasonable explanation for why soaps form scums with ions like Ca2+ but not with Na+. 2. Compare the previous results with the test with tap water. Do you believe you have hard or soft water in your area?

What types of aquatic life migrations are there and why do they occur?

1) Offer a reasonable explanation of why nitration of 1,4-dichlorobenzene yields mononitro derivative while N,N'diacetyl- 1,4Phenylene-...

1) Offer a reasonable explanation of why nitration of 1,4-dichlorobenzene yields mononitro derivative while N,N'diacetyl- 1,4Phenylene- diamine forms dinnitro compound. 2) Explain why p- nitrophenol is a stronger acid than phenol itself. Would P-methoxyphenol be a stronger or weaker acid than phenol? Expain.

Many studies depend on eDNA to collect samples from aquatic environments because: A. DNA disperses and...

Many studies depend on eDNA to collect samples from aquatic environments because: A. DNA disperses and remains free floating in a body of water B. An electric current is run through water to collect negatively charged DNA C. They are less likely to show false positives or false negatives D. DNA clumps when in an aqueous solution and clumps are easy to collect

Why did Fred Hoyle propose the Steady State Theory?

Why many people tend to hold more money, while some other people prefer to hold less...

Why many people tend to hold more money, while some other people prefer to hold less money. And why the interest rate serves as the opportunity cost of holding money?

In 3–4 paragraphs: Enumerate as many DNS errors as you can, and propose a method to...

In 3–4 paragraphs: Enumerate as many DNS errors as you can, and propose a method to detect one of them, or a small cluster of related ones. Analyze the errors you have chosen for their potential to be used as a deliberate or accidental attack (for example, a man-in-the middle attack). Propose a method to reduce or eliminate the risk. Since some problems are only truly fixed by updated software or infrastructure, there may be interim workarounds, so you may...

How many times will the following while loop iterate? int i = 1; while (i <...

How many times will the following while loop iterate? int i = 1; while (i < 5) { i = i + 1; System.out.println(“Hello!”); } Group of answer choices 4 0 5 It will iterate infinitely

Illustration: Whether they have to or want to, many students work while attending college and many...

Illustration: Whether they have to or want to, many students work while attending college and many students even attempt to do both full-time. Discuss three difficulties students face when they work while going to school. Be sure to provide three clear examples to support your point. Use third-person examples, do not write the essay as a narrative.

Subjects