The correct answer is true. I really hope this helps!
Heliotrophism is the answer to your question.
Radiometric dating reveals the exact (i think its exact) age of a fossil.
Answer: Pulmonary aortic valve
Explanation:
<span>Fireflies
use the bioluminescence to attract mates for mating hence key in reproduction.
Therefore, beetles from different species should have different lighting
patterns so that they can only attract mates of the same species. This would
avoid interspecies mating which would probably involved expending energy in
produce nonviable offspring which is inefficient (hence will be unfavoured
natural selection). </span>