Answer is B. Best way to check is make a square
Answer:
there are 4: paracrine signaling, autocrine signaling, endocrine signaling, and synaptic signaling
Explanation:
paracrine:cells that are near one another communicate through the release of chemical messengers
autocrine: a cell signals to itself, releasing a ligand that binds to receptors on its own surface
endocrine:When cells need to transmit signals over long distances, they often use the circulatory system as a distribution network for the messages they send.
synaptic: nerve cells transmit signals. The junction between two nerve cells where signal transmission occurs.
Answer:
The Sun is not a biomass energy source.
Explanation:
Biomass is plant or animal material used for energy production. The Sun is neither plan nor animal material. Paper is produced by wood, wood chips also, manure is from animals so all those are a biomass energy source.
Answer:
D. It is non-living
Explanation:
If something is not made of cells, it cannot be alive.
