A young marsupial is developed inside of a pouch until they are mature enough to go out on their own. They are included with such mammals as: Kangaroos and Opossoms.
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I believe your answer is Blood
Answer:
amphibians, fish
Explanation:
tiktaalik possessed a combination of fish-like features and amphibian-like features.
Answer: Respiratory gases(Oxygen)
Explanation:
The essential role of cadio vascular system is to supply blood; containig metabolites (glucose,amino acid, fatty acid and glycerol) and gases expecially Oxygen,needed for combustion of these nutrients(metabolites) in mitochondrial of cells (cellular Respiration) to generate ATPs for biochemical activities of the body.
C. The branch of biology that deals with interactions of organisms with each other and the surroundings :)
