Pollution in an ocean ecosystem has caused a significant drop in sea otter population. Within a year, scientists monitoring the ecosystem note that the sea
urchin population on which the otters feed has greatly increased. The prevalence of
sea urchins has caused the kelp and algae populations on which the urchins feed to
decrease. The scientists fear the urchins will also begin to overwhelm the ecosystem's fragile coral population. Which species is most likely the keystone
species in the ecosystem?

Algae
Coral
Sea star
Sea urchin

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

Which benefit of the community experience when its members have a hide level of health literacy