How does propionibacterium acnes cause acne in humans? a. overuse of antibiotics can cause bacteria to clog pores in humans. b. this type of bacteria is found on the human skin, and it can clog pores. c. this type of bacteria often enters a cut and causes an infection in humans. d. close contact with an infected person can lead to acne in humans.

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Which of the following statements about protists are true? a. they are typically found in moist environments. b. they are all unicellular. c. they have a nucleus. d. they are all multicellular.

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone