Acommercial industry employs scientists who conduct tests in order to develop new summer products for sale. as the push for new summer products designed to ward off mosquitos begins, the scientists test rainforest plants for the presence of

phytochemicals

Explanation:

Phytochemicals can be described as a type of chemical compounds which are produced by the plants against predators, pathogens etc. Some phytochemicals are used by humans as poison whereas others serve for medicinal purposes. Phytochemicals also reduce the risk of cancer.

In order to ward off mosquitoes, scientists will look for effective phytochemicals against the mosquitoes. These phytochemicals, when discovered can be used to treat humans and help them protect from mosquitoes.

My opinion is that it is:

b. they have been on earth's only hominine for the last 24,00 years.

and for ga connexus, the answers are:

1: c
2: c
3: a
4: b
5: b

guaranteed 100% for ga connexus. this lesson exactly:
lesson 7: primate evolution and diversity