Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
The Dorsal Spines give the fish, "3 Spined Stickleback", because they have hard, spines on their backs. I hope this helps!!!
It's very likely that the catcus with short spines will die out faster than the cactus with long spines.
Answer:
A.
Explanation:
All other options are simply situational, while cold periods are usually seasonal.
Answer:
insulin/glucose/liver/pancreas