Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
The difference between RNA and RNA both are not the same but they are different.
Option A is correct. Your olfactory nerve is the first cranial nerve (CN I). It's also section of your autonomic apprehensive system, which regulates physique functions. This nerve enables your feel of smell.
<h3>What are olfactory signals?</h3>
Listen to pronunciation. A sequence of occasions in which cells in the nose bind to scent-bearing molecules and send electrical indicators to the talent where they are perceived as smells.
<h3>What is an example of olfactory?</h3>
The excellent smell of spring flowers, for example, may be considered an "olfactory delight." A associated word, olfaction, is a noun referring to the experience of scent or the act or procedure of smelling.
Learn more about olfactory here:
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Answer:
This says that a very long time ago South Africa could have had glaciers and had a cold climate were as now South Africa has a very hot and humid climate.
First blank space is endocrine system and the second blank is hormones
