1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Daniel [21]
3 years ago
11

The order Cetacea includes modern-day whales, dolphins, and porpoises. These marine mammals share common characteristics that ha

ve led scientists to make a conclusion about their evolutionary history. Cetaceans:
lack gills and must breathe air
give birth to live young rather than lay eggs
have fin bones that are similarly shaped to limb bones
have spines that flex up and down rather than side to side
The characteristics of cetaceans provide evidence that

A. they evolved from land mammals.

B. the theory of evolution is incorrect.

C. they evolved from air-breathing fish.

D. the bodies of their ancestors never changed.
Biology
1 answer:
allsm [11]3 years ago
6 0

Answer:

The correct option is <u><em>A. they evolved from land mammals.</em></u>

Explanation:

The process of evolution explains how closely one organism is to another based on their common ancestors. Scientists believe that those organisms which show many similarities in their structures or functions might have evolved from a common ancestor in the past.

As in the above-mentioned question, scientists have observed that cetaceans lack gills and breath air, this is a property of land mammals. The cetaceans have fin bones which are similar to the limb bones. As limb bones are present in land mammals, hence they cetaceans and land mammals might have common ancestors in the past.

You might be interested in
White moths were found in huge numbers in the English city of Birmingham. These moths could be easily camouflaged by the trees b
ICE Princess25 [194]
Now that white moths don't have good camouflage in the trees, which have become dark with soot and made the moths easier to be seen, this change would decrease the population of the white moth because more predators will be able to see and eat them. 
5 0
3 years ago
Read 2 more answers
Help 15 points<br><br> What 2 major air masses lead to the tornadoes in Tornado Alley?
Thepotemich [5.8K]

Answer:

It's along the front between the two airmasses that most tornadoes form.

Explanation:

3 0
3 years ago
Read 2 more answers
True or False: DNA replicates before creating proteins
EastWind [94]

Answer:

True

Explanation:

Hope this helps!!!!

5 0
2 years ago
Read 2 more answers
It is a statement of judgment of a person about something in the world.<br>​
Kaylis [27]

Answer:

heres your answer :)

Explanation:

Declarative Statements are the kind of statements which expresses someone's belief, view, or judgment about something/someone.

7 0
2 years ago
Which of the following best describes an aspect of a membrane's molecular structure that causes it to be selectively permeable?
atroni [7]

Answer:

<u>d. Transport proteins within the membrane serve as a tunnel for molecules to enter the cell. </u>

<u />

Explanation:

Solutes are typically moved across the cell through either passive or active transport. The cells, surrounded by a bilipid layer or plasma membrane is amphiphlic- its polar, hydrophilic lipid heads face outwards, while their non-polar hydrophobic lipid tails face inwards towards each other.

While lipid-soluble molecules move across the layer easily, it is also difficult for charged and also large molecules to move across its surface, into the cell. Transmembrane channels, <u>embedded within the membrane</u>, help to maintain selective permeability as transport proteins, pores and gated channels. Simple diffusion happens as a method of passive transport in cells through plasma membranes.

The solutes travel through the plasma membrane in the process of diffusion from regions of high concentration to regions of low concentration; this occurs without the use of energy. <u>Molecules moving against their concentration require active transport mechanism to cross the membrane</u>.

3 0
3 years ago
Other questions:
  • Describe the modern system of classification
    10·2 answers
  • Compounds formed from attraction of oppositely charged ions are called
    15·2 answers
  • What are the two main ways that scientists learn about Earth's interior and what do these two things indicate?
    7·2 answers
  • The pH scale has a range of __to__
    5·1 answer
  • if you were given a slide containing living cells of an unknown organism .how would you identify the cells as either plant or an
    15·2 answers
  • When jumping into water you notice resistance. this resistance is caused by water's __________?
    5·1 answer
  • In living cells chemical processes such as synthesis all require the action of
    15·2 answers
  • How much DNA is found in a
    11·2 answers
  • Which of the following organisms carries out autotrophic nutrition? (1) Algae (3) Grass (2) trees (4) All the above (5) None of
    6·1 answer
  • Find out which animal is actually most closely related to the hawk: shark, bat, or alligator. Report your findings and explanati
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!