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Food web with three food chains. Arrows point from one organism to the next in the chain. Chain 1: kelp, kelp crab, sea otter. Chain 2: kelp, sea urchin, sea otter. Chain 3: kelp, sea urchin, horn shark, elephant seal.
Which organisms are secondary consumers? Check all that apply.

A. Kelp
B. Kelp Crab
C. Sea Otter
D. Sea Urchin
E. Horn Shark
F. Elephant Seal

Need will mark ! which features are created by groundwater erosion and deposition? check all that apply. a. stalagmitesb. sinkholesc. rillsd. stalactites e. gullies f. rivers

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

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?