What causes variations in traits such as hair color, eye color, and height? A. Alleles
B. Competition
C. Fitness
D. Offspring

Nitrofurantoin used during the fifth week of pregnancy places the neonate at risk for which condition?

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

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels