2. Which diagram best illustrates an event in sexual reproduction that would most directly
lead to the formation of a human embryo?
(1)
(2)
+
) (4)
G
+

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.

Which of the following is a common danger of commercial fishing?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere