Two simplified food chains are shown here for a terrestrial and a marine ecosystem Assuming there is 100% availability of energy for the primary producers for each chain, which statement describes the energy availability at other levels of the food chain?

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Veronica and her little sister, monique, are playing on a seesaw. if veronica weighs 75 pounds, and monique weighs 60 pounds, which statement is true?