To which trophic level do elk belong?
a. producer
b. decomposer
c. primary consumer
d. secondary consumer

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?