Well, since its about it needing to survive and reproduce in a specific environment, it should be fitness.
The correct answer is False! A Penumbra is the lighter outer region of a shadow! Hope this helps! ;D
If thats the question, Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique.