A student makes the analogy that the cardiovascular system is like a highway. Why is this a good analogy? A. Blood is made of many different kinds of cells.
B. The heart pumps blood through the veins.
C. The heart is centralized in the body.
D. Blood transports materials to and from different parts of the body.

What are some things that limit population growth?

Study the image of this rock.which characteristic best supports its formation from sedimentary processes? it has many layers.it is coarse-grained.its grain shape is round.its texture is non-banded.

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables