An igneous rock that formed from magma cooling slowly would have A. a fine grain
B. large crystals
C. no crystals
D. no grain

B

Explanation:

If magma cools very slowly, few centers of crystal growth develop. Slow cooling also allows charged atoms, or ions, to move large distances within the magma. Slow cooling results in the formation of large crystals. Igneous rocks with large crystals exhibit a coarse-grained texture.

a fine grain

Explanation:when magma cools slowly below the Earth's ... Most intrusive rocks have large, well-formed crystals. ... Coarse grain varieties (with mineral grains large enough to see without a ... Fine grained rocks.

the wrong statement is - c. a desert had more biodiversity than a marsh.

the deserts are one of the places of the planet where there's the least biodiversity. the reasons for that are the climate and the lack of food sources, which hampers both the number of the species that can survive in it, and the number of the individuals in the species itself.

the marshes, on the other hand, are places where there's perfect conditions for lots of organisms to thrive. the temperature is moderate and nice, the amount of water and the food sources are on a high level, so there's an abundance of both plant and animal life in them.

the answer is crop rotation