Expendable can mean having little to no value when compared to the big picture or something that's designed to only be used once and then destroyed. Since I don't have any context, I can't decipher which one it would be.
Answer:
Evolution, of course is the process of change in all forms of life over generations and evolutionary biology is the study of how evolution occurs. Biological populations evolve through the changes in the organisms' observable traits. All life on the planet exists because it evolves to best fit the environmental conditions and those who adapt best, pass on those characteristics to their offspring. In other words, descent with modification.
Explanation:
I majored in Biology
Answer:
Chambers
Explanation:
Oxygen-rich blood travels from the lungs to the left atrium, then on to the left ventricle, which pumps it to the rest of the body. The heart pumps blood to the lungs and to all the body's tissues through a sequence of highly organized contractions of the four chambers.
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