Compare the forces for 2, 4 and 8 meters. How did the size of the gravitational force change when you doubled (two times) or quadrupled (four times) the original distance?

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

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.