Which location shown on the diagram identifies earth's hottest layer?
a) location a
b) location b
c) location c
d) location d

Which are observations about the tree on the right ,? check all that apply

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.

Give examples of selective advantage of organism’s body part/organ