Nitrogen is one of the important elements for life. Nitrogen is present in DNA and proteins. It’s also a component of in plants, a pigment that’s critical for photosynthesis. Although nitrogen is present in the air, it can’t be consumed directly. It’s converted into usable form by .

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

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

What is the role of the phospholipid belayer in cellular transport in living cells