Ligand-gated ion channels are ; g protein-coupled receptors are a. slow/ionotropic; fast/metabotropic b. fast/ionotropic; slow/metabotropic c. slow/metabotropic; fast/ionotropic d. fast/metabotropic; slow/ionotropic

The answer is b. fast / ionotropic; slow / metabotropic. There is fast neurotransmission since the ligand – gated ion channel receptor is directly activated by the neurotransmitter.  On the other hand, G – protein coupled receptor is bound to the neurotransmitter in order to stimulate a chemical signaling cascade which has a longer pathway, thus, making it slow and metabotropic.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

a. the production of carbon dioxide through the process of photosynthesis