Answer:
the cell is the smallest functional unit
The answer is (D), because none of the other answers make sense
Moonlight. Turtles generally don't care if it's day or night.
The cell grows to its mature size
Cinder cone - a very tall and broad-sloped peak made of mostly lava flow
Composite - a very tall, steep-sloped peak made of both lava and volcanic materials
Shield - a shorter peak made of ash and volcanic rock