Approximately how much energy is available to the secondary consumers in this energy pyramid?

1) What is an ecosystem? a. A region with a specific climate. b. A community of interacting organisms and their environment. c. An area of untouched nature. d. None of the above.

What organisms began to grow in large numbers in lake Washington as a result of the release of effluent from sewage treatment plants?

Do Mammals and plants belong in the same domain?

The skeletons of a saber-toothed tiger and a present-day tiger are shown above. Which of the following is a structural difference between the saber-toothed and the present-day tiger?

Which feature of the lung cell allows oxygen to pass through quickly? Choose one answer. A: It is thin B: It has a large nucleus C: It has many mitochondria

Complex DNA repair mechanisms in many organisms is a challenge to Darwinian evolution because DNA repair is complex involving many proteins and Darwinian evolution would need to evolve all of these proteins simultaneously. True False

What do all disease causing viruses need in order to reproduce

Which term refers to a landslide? cave formation mass wasting pollution sedimentation

Which statement describes the term "heterozygous"? A) The alleles are the same. B) The alleles are different. C) There is no allele. D) There are two pairs of alleles.

Label the levels of biological organization in order from simplest to most complex