Earth is not filled to the brim with elephants, or ants, or ferns, or geckos. what prevents a population from growing forever

Mike has a problem with his testosterone. he is unable to produce enough. which will most likely be affected by his inability to produce testosterone? check all that apply.

Agriffin is a mythical creature that appears in many stories. it has the head of an eagle and the body of a lion. what role if any could the griffin have in the science of biology

How can scientists use the fossil record to find evidence of relationships between different species?