<span>productivity 20 character.
</span>
There is no image or choices so what exactly do you want us to answer.
Answer:
<h2>B
</h2>
Explanation:
1. Amphibian's heart is three-chambered from which two are atria and only one is ventricle.
2. And there is two circulatory pathways having different routes.
3.There is mixing of oxygenated and deoxygenated blood in case of amphibians.
4. And in case of mammals there is no mixing of blood,, both the oxygenated and deoxygenated blood is completely separate.
5. Mammal's heart contain four chambers from which two are atria and two are ventricle, and they completely separate both the oxygenated and deoxygenated blood.
Observation can be called the process of gathering data. Data, is factual that has scientific evidence to proof.