What causes the differences in physical characteristics like hair color among people?

A: different version of genes

B. Variations in DNA length

C. Different number of chromosomes

D. Variations in nucleus size

Hurry in a test

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.

What types of energy transfers and energy transportations are involved in the domino chain reaction?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?