The correct answer here is "cell membrane". Generally it makes sure that nothing enters or leaves the cell, except by its highly guarded "gates", such as ion channels, that let some particles through - but they're very picky about whom to let in!
The correct option is A.
Post parturient refers to the period after a living organism have given birth to offspring. Post parturient ketosis is a type of ketosis that occur to a female animal after she has given birth to young ones. Glucose is the major fuel that living organisms used to generate energy, when there is shortage of glucose, the body use fat instead as fuel and this leads to the production and build up of ketone bodies. The build up of ketone bodies increases the level of ketones in the blood and this state of metabolismis called ketosis.
A. He should add shells that are different colors, but the same size and type, to the tank and observe which shells the hermit crabs choose.
Durning an experiment you need to keep everything the same but only change the certain things based on your theory.
Such as how the student wanted to see if the color attracted the crab. If he had changed the size and type of the shell then the crab would have chosen the bigger one as they tend to grow into larger shells.
Aggergate is usually found in:
Floodplains
Alluvial fans
Mines
The best way may be is going over the notes on the chapter you were doing. Or going over the chapter once or twice.
