Apostsynaptic cell can be a neuron, a muscle cell, or a secretory cell. what is an example of a presynaptic cell?
a) a neuron
b) a secretory cell
c) a schwann cell
d) a muscle cell

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

The bacteria inside a tube worm would be analogous to what organism in the ocean ecosystem near the waters surface? a. photosynthetic algae b. shrimp c. clown fish d. parasitic lamprey

These are the components of the reservoirs of carbon that are exchanged in our environment.