In the Sierra Nevada mountains of California there are many populations of the checkerspot butterfly, Euphydryas editha. You notice that females of one population (population A) lay their eggs near the tip of a plant’s stem. Females of another population in the same area (population B) lay their eggs at the base of the stem on a different type of plant. The young hatch out as caterpillars; they live on the host plant and eat its leaves. Is the information above a complete description of the butterflies’ niche?

Which term refers to the total dollar value of the goods and services produced in a country in a year?

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed