PLEASE HELP! Which of the following mutations would be most likely to have a harmful effect on an organism? A. a deletion of a guanine base near the center of an intron

B. a substitution of a thymine for an adenine

C. a deletion of 3 bases near the center of a gene

D. an insertion of a cytosine base near the start of an exon

2. if scientists identify an animal with bilateral symmetry and no segmentation, which phylum can it definitely not belong to? a. roundworms b. annelids c. mollusks d. flatworms

According to the cladogram, which organisms have roundworms as a common ancestor?

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.