Which of the following is one reason that quartz is classified as a mineral? A
It has a chemical formula and a specific crystal structure.

B.
It can be melted at high
temperatures.

C.
It comes in many different colors.

D.
It can be manufactured in a laboratory.

What are they five steps of cloning?

What characteristic makes a cell membrane selectively permeable

Choose the best definition of allele. a. one of several possible versions of a gene, which each produce a different phenotype b. an organism that's purebred for a given trait c. the process of fertilizing a plant with pollen from another plant d. a set of genes that are located on the same chromosome and so are tightly linked