CRISPR-Cas9 is a genetic modification technique that edits parts of the genome of an organism. Using this technique scientists can add, remove, or modify sections of the DNA sequence. How can scientists use this technique to control gene expression?
A. By activating or deactivating specific genes
B. By determining the number of chromosomes in an organism.
C. By calculating the number of genes different organisms produce
D. By identifying how closely related one individual is to another

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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wegner's theory did not explain how the continents could move

explanation:

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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