What is the main function of chloroplasts? Choose 1

(Choice A)
A
To store food, water, and waste

(Choice B)
B
To package and sort proteins

(Choice C)
C
To convert sunlight into usable sugars

(Choice D)
D
To produce ATP for the cell

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Anybody wanna ? (picture included? )

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?