Answer:
a. is composed of two layers.
Explanation:
Hope it helps.
I would choose C.
A isn't the best of option because it does not directly mention fresh vs. salt water.
B does not make sense because it is discussing introduced species not native ones.
And D literally just has no relevance.
I would go with C because it is literally drawing attention to introduced species because of dumping ballast waters.
Answer:
The earths interior is super hot and compressed, it is made of iron and nickle
The rocks down there are really fine and compressed while rocks on the surface are sedimentary, have air pockets, and are not as fine as rocks in the core.
Explanation:
B is the answer. Dry raisins swell up because they undergo Endosmosis. When a rasin is put in water then the water passes through the semipermeable membrane
The charcoal produced by the burning of the woods provides nutrients for reforestation.