78% of earths atmosphere contains this nutrient in the form of gas. all living things require this nutrient to make proteins and it is found in the waste products of many living things?

There are several theories that exist concerning the way dinosaurs became extinct. If new evidence is found that appears to challenge part of a particular theory on dinosaur extinction, what happens to the old theory? It is replaced. It is modified.

Where is the best position for a lamp you use to read in the dark?

List 4 main components of air in their molecular form

Why do many fishermen support efforts to protect and restore mangrove forests? a. most fishermen are environmentalists. b. many fish breed in mangrove forests. c. they lay their nets in mangrove forests. d.

1. what is an unintended consequence of using cardboard to cover the grass? 2. What is an unintended consequence of using herbicide?

An object that does not transfer heat easily, such as wood, is called an A) metal B) conductor C) insulator D) capacitor

In which phase of meiosis does the chromosome number change from diploid to haploid? Prophase I Anaphase I Prophase II

Irene occasionally experiences unpredictable episodes of intense dread accompanied by chest pains and a sensation of smothering. Since her symptoms have no apparent cause, they would probably be classified as indicative of:

A scientist has discovered the means to block the chemical that directly provides cells with energy for cellular processes. Which cell substance is most likely to be inhibited by this discovery?

For questions 4 and 5, refer to the passage below. Many cells make and use an enzyme, called catalase, to facilitate the decomposition of hydrogen peroxide (H2O2). The products of the decomposition are hydrogen (H2) and oxygen (O2). 4.