What are the characteristics of the central nervous system? select all that apply.

1: it is made up of the brain and spinal cord.

2: it is a system of bones that supports the body.

3: it uses the spinal cord as a pathway to transmit messages to the pns.

4: it contains networks of nerves called plexuses.

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How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.

What type of plant is good for a bioassay and where can i buy it? i only have a month.