Answer:
Mammals, insects, fish and plants all have different systems of exchanging gas. For mammals we breathe into our lungs, for fish they use gills and insects use spiracles.
Explanation:
hope it kind of helps sorry if it doesn't
Cretaceous jurassic triasic
Answer:
a
Explanation:
a just trust me on this one
The first generation in a genetic cross is called B. F1 generation. Then the next generation is known as the F2 generation.
Your answer is B. F1 generation
