Adaptation: Question 7
Which BEST explains why a population of a certain species of cactus developed longer spines over time?
Select one:

An animal migrated into the area, and it could only eat short-spined cacti.

A reptile moved into the area, and it could only eat cacti with either very short or very long spines.

A bird migrated into the area, and it could only eat long-spined cactus.

A mammal migrated into the area, and it could only eat cacti with medium-length spines.

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

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?