What hormones stimulate the cycle of egg or sperm production?

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.