Name two gases in the atmosphere that are essential for life

Marianne is comparing two animals: a fruit fly and a fruit bat. she asks, "do a fruit fly and a fruit bat share a common ancestor in their evolutionary history? " according to evolutionary theory, what is the answer to marianne's question?

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength

What is the cause hearing loss in human being