The ________ are the simplest animals to have an excretory system. (Hint: This system consists of cilia beating within canals.)
Fill in the blank(s) with correct word
flatworms
You might also like to view...
Which category of animals had the most threatened and endangered species in 2012?
a. birds b. fishes c. insects d. reptiles
Which of the following organisms would be most likely to fossilize?
A) a rare worm B) a common worm C) a rare squirrel D) a common squirrel
In the process of crossing over:
A) sister chromatids separate. B) homologous chromosomes separate. C) sister chromatids exchange genetic material. D) maternal chromosomes assort independently of paternal chromosomes. E) non-sister chromatids of homologous chromosomes exchange genetic material.
You are viewing a blood vessel under the microscope. You see three distinct layers, one of which is a thick muscular layer. The layers are separated by extensive elastic tissue. This vessel is most likely a(n)
A) capillary B) arteriole C) vein D) artery