The Perennial Pepperweed was first introduced in Las Vegas during the 19th century. This weed damages the soil and makes it impossible for other plants to grow around
it. It has been continuing to spread in southern Nevada and threatens many
organisms in the area. The Perennial pepperweed is an example of:

A. An endangered species.

B. An invasive species.

C. An abiotic factor

D. A non-living factor.

Choose the molecule that is described by each phrase. energy used during long activities:

Indicate whether the following statements about the biases in the fossil record are true or false. a) inland species are more likely to be preserved than marine species b) organisms with hard body parts are more likely to be preserved than are those composed soft tissues. c) species that existed over a larger area are more likely to be preserved than species existing over a smaller area. d) organisms that lived very long ago are more likely to be found as fossils than organisms that lived relatively recently e) the fossils of larger organisms are more likely to be found than the fossils of smaller organisms

How can you approximate the number of calories required to keep you in energy balance?