D : the number of generations in one population
<span>A reef supports many different niches for organisms that live under, on, and among the coral.</span>
The axon carries messages in the form of action potentials from the cell body to its end feet, which synapse upon other neurons or effector organs. Cells with long axons are called principal neurons. These cells establish the pattern of connectivity within the nervous system....did this help you?
Okay so there are two types of ERs, smooth and rough.
Rough endoplasmic reticulum contain ribosomes on the outer surface. It provides large surface area for proteinsynthesis and the synthesis of glycoproteins and also provides a pathway for the transport of materials.
Smooth ER synthesises, stores and transports lipids and carbohydrates.
Hope this helps