All organisms in an ecosystem take part in a hierarchy of feeding relationships called __________. Fill in the blank(s) with the appropriate word(s)
ANSWER: trophic levels
You might also like to view...
Some genetic mutations occur from exposure to external agents called ____, such as radioactivity, ultraviolet radiation from the sun, and certain natural and human-made chemicals.
A) ?mutagens B) ?heritable traits C) ?keystones D) ?niches E) ?antibiotics
____ is an adrenal hormone that makes kidney tubules more permeable to sodium and encourages sodium
reabsorption, thus increasing water reabsorption and concentrating the urine. a. ADH b. ANP c. Angiotensinogen d. Aldosterone e. AMP
It is notoriously difficult to perform unbiased studies when human subjects are used. When governmental agencies such as the U.S
Food and Drug Administration (FDA) are trying to determine the validity of scientific claims, they very closely examine the methods used in the experiments. What are the three phases of clinical trial, and which one(s) must a drug pass in order to be sold in U.S. markets?
Which virus employs the use of an RNA-dependent RNA polymerase?
a. dsDNA viruses b. Retroviruses c. ssDNA viruses d. +RNA viruses