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
Firlakuza [10]
2 years ago
9

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts.

Birds and mammals, however, are alike in having 4-chambered hearts. The 4 chambered hearts of birds and mammals are best described as
Biology
1 answer:
MatroZZZ [7]2 years ago
3 0

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts. Birds and mammals, however, are alike in having 4-chambered hearts. The 4 chambered hearts of birds and mammals are best described as homoplasies.

<h3>What about homoplasies?</h3>
  • It is more frequently a modified version of an inherited characteristic.
  • For instance, the scales that were already present in its reptilian parent led to the evolution of feathers in birds.
  • Similar to reptiles, mammals developed fur from their predecessors' scales.
  • The same set of data can typically yield more than one potential cladogram.
  • Different species of legged lizards developed into snakes and lizards with limbless bodies.
  • Natural selection does not affect a sizable number of mutations.
  • They came to the conclusion that reptiles, birds, and mammals all descended from the same ancient reptilian progenitor.

Learn more about mammals here:

brainly.com/question/5400162

#SPJ4

You might be interested in
When blood glucose levels drop, which hormone brings glucose out of storage to raise blood glucose levels?
Serggg [28]
Glucagon is the hormone that helps in restoring the levels of blood glucose levels. It is produced by alpha cells of the pancreas. It stimulates the liver to break the glycogen, so that they may be utilized by the body, as a source of energy. It also stimulates glucose synthesis in the body.
5 0
3 years ago
What structure is formed during the unwinding process of replication?
miskamm [114]

Answer:

The correct answer is C. replication fork.

Explanation:

3 0
3 years ago
Read 2 more answers
What leads to increase genetic variation in a population
il63 [147K]

Genetic variation happens when one organism in the population mates with a genetically different organism. Same species, different genetics such as color or height/weight.

8 0
3 years ago
Read 2 more answers
Which of these is an environmental change that occurs rapidly?
den301095 [7]
It would be C.

because it would destroy an environment very very rapidly for anything in its path
6 0
3 years ago
Read 2 more answers
The preferential use of phosphatidylinositol and phosphatidylethanolamine in the cytoplasmic leaflet of membranes leads to incre
spayn [35]

Answer:

The best answer to the question: The preferential use of phosphatidylinositol and phosphatidylethanolamine in the cytoplasmic leaflet of membranes leads to increased:___ would be, D: All of the answers are correct.

Explanation:

There is still a lot of debate among scientists as to the exact way in which phospholipids are distributed between the two leaflets of a cell´s plasma membrane, but what they do know is that there are four kinds, and that phosphatidylinositol (a sterol) and phosphatidylethanolamine appear most commonly on the cytosolic, or cytoplasmic side of the membrane. They also believe that it is this particular arrangement which allows the cytoplasmic side of the membrane to be slightly negatively charged and this role will play a major part in a membrane´s ability to generate an action potential. Also, it is known that these negatively charged ends of the bilayer will allow certain proteins, positively charged ones, to be inserted, and connected to it, to become transporters, or mediators in action potentials and normal activities of cells. Finally, since fatty acids and cholesterol are associated with phospholipids, but have a tendency to be attracted to these particular two types, they tend to give the overall structure fluidity, but also permit  the inner leaflet to assume its particular circular shape around the cytoplasm. This is why the answer is D.    

4 0
4 years ago
Other questions:
  • Which words describe an air mass likely to be over the northern parts of the Pacific Ocean?
    6·2 answers
  • Some species of stick insects have wings, others are wingless. recent research indicates that wings have been gained and lost se
    5·1 answer
  • Nancy is in her building elevator going down to the lobby when the elevator stops suddenly between floors, and the doors won't o
    13·1 answer
  • Which part of a cell allows nutrients and other materials to enter or leave the cell? A. chloroplast B. cytoplasm C. nucleus D.
    14·2 answers
  • The main difference between prokaryotic and eukaryotic cells is that
    12·2 answers
  • What are the elements that are most abundant in biomolecules
    13·1 answer
  • Which of the following is true of annelids? a) They have a gastrovascular cavity. b) They have an open circulatory system. c) Th
    8·1 answer
  • T
    6·2 answers
  • PLEASE HELP. I WILL GIVE YOU BRAINLIEST!
    9·2 answers
  • Why do scientists think current warming trends are not simply Earth's natural
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!