Which of these animals does not have a closed circulatory system?

A. earthworm
B. fly
C. leeches (a type of annelid)
D. frogs
E. killer whales


Answer: B. fly

Biology & Microbiology

You might also like to view...

The electrical component of an electrochemical gradient is due to:

A. the use of ATP as an energy source to drive primary transport. B. a greater concentration of positive charges on the side of the membrane with the lowest concentration of protons. C. a higher pH on the side of the membrane with the highest concentration of protons. D. a higher pH on the side of the membrane with the lowest concentration of protons. E. a greater concentration of positive charges on the side of the membrane with the highest concentration of protons.

Biology & Microbiology

Judy had plaque buildup in her arteries. When one of these ruptured, a blood clot traveled to

her brain where it blocked blood flow, resulting in death of some of the brain cells. This is an example of __________.

a. a stroke b. atherosclerosis c. coronary heart disease d. a carcinogen

Biology & Microbiology

If you found a mutation, involving the loss of two bases, which was present in humans living on all four continents which you could test but was absent in close relatives such as gorillas and chimps, what would this imply?

A. Two bases were actually insertions in the nonhuman primates. B. Deletion arose before the branch between humans and nonhuman primates. C. Deletion arose in multiple nonhuman primates. D. Deletion arose at least six times in different human populations. E. Deletion arose after the branch between humans and nonhuman primates.

Biology & Microbiology

Which of the following relationships between cell structures and their respective functions is not correct?

a. cell wall: support, protection b. chloroplasts: chief sites of cellular respiration c. chromosomes: genetic control information d. ribosomes: site of protein synthesis e. mitochondria: formation of ATP

Biology & Microbiology