Who observed that organisms in a population differ slightly from each other in form, function and behavior?

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?