Which organism in the marine ecosystem is the most numerous: producers, primary consumers, or secondary consumers? Why?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes