Earthworms, like the one seen here, live in soil. Bennie wondered how changes in the moisture content of the soil would affect the movement of worms. He wanted to design an experiment to test his idea. What would be Bennie's manipulated variable in the experiment? A) size of the worms
B) moisture of the soil
C) movement of the worms
D) temperature of the soil

Researchers studying a small milkweed population note that some plants produce a toxin and other plants do not. they identify the gene responsible for toxin production. the dominant allele (t) codes for an enzyme that makes the toxin, and the recessive allele (t) codes for a nonfunctional enzyme that cannot produce the toxin. heterozygotes produce an intermediate amount of toxin. the genotypes of all individuals in the population are determined (see chart) and used to determine the actual allele frequencies in the population.is this population in hardy-weinberg equilibrium? a) yes.b) no; there are more homozygotes than expected.c) no; there are more heterozygotes than expected.d) more information is needed to answer this question.