Actin and myosin are important proteins associated with the select one: a. contraction of muscles. b. synthesis of glycogen. c. production of hemoglobin. d. polymerization of dna.

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

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 process of living things produces water that enters the water cycle