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docker41 [41]
4 years ago
15

The common ancestors of birds and mammals were very early (stem) amniotes, which almost certainly possessed three-chambered hear

ts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The four-chambered hearts of birds and mammals are best described as ________.
Social Studies
1 answer:
sashaice [31]4 years ago
8 0

Answer:

homoplasies

Explanation:

According to my research on studies conducted by various biologists, I can say that based on the information provided within the question the four-chambered hearts of birds and mammals are best described as homoplasies. In the context of biology, homoplasy is a trait or character that is found in a set of species but not present in their common ancestor.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

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A rat in a Skinner box receives a food pellet every ten times the bar is pressed. The rat is on a _____ schedule of reinforcemen
e-lub [12.9K]

Answer:

Fixed ratio

Explanation:

The Fixed ratio schedule is used in ope-rant conditioning. Ope-rant conditioning is work on the relationship of response and stimulus due to that the behavior of a subject has been changed.

As the name indicated the reinforcement is being given after a fixed ratio for example after every ten times the reinforcement is provided to the rat in the box. So the rat can learn the behavior.

In this type of reinforcement, the schedule will remain constant. If the reinforcement is not provided after a fifth, tenth or any fixed number then it won't be a fixed ratio.  

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3 years ago
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3 years ago
Which of the following will she be able to measure using the crest or trough of a single wave? A. the energy; It is only found i
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6 0
4 years ago
Under what circumstances should the delegative style of leadership be used?
sammy [17]
Laissez-faire leadership, also known as delegative leadership, is a type of leadership style in which leaders are hands-off and allow group members to make the decisions.

This style should be used when

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2. When group members are experts. The delegative style can be particularly effective in situations where group members are actually more knowledgeable than the group's leader. Because team members are the experts in a particular area, the laissez-faire style allows them to demonstrate their deep knowledge and skill surrounding that particular subject.

3. When independence is valued. This autonomy can be freeing to some group members and help them feel more satisfied with their work. The laissez-faire style can be used in situations where followers have a high-level of passion and intrinsic motivation for their work.
5 0
3 years ago
Whats the discrimination against other minorities in the world today?
PIT_PIT [208]

Answer:

the discrimination of minorities in the world today are:- 1) confisticate of land

2) No loans given

3) thats it

Explanation:

no

3 0
3 years ago
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