ASAP please help me! What is a dorsal notochord? A. part of the nervous system in both vertebrates and invertebrates. B. part of most chordate embryos that develops into a spinal column (vertebrae). C. part of chordates that protects the circulatory system. D. part of mammals only that develops into the spinal column.

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.