What substance is needed to carry out

respiration?

A oxygen

B carbon dioxide

C nitrogen

D carbon

Given this data, Jackson concludes that only Unknown 2 could be a protein. Which of the following explanations supports Jackson's conclusion?

What are the most useful diagnostic Technology for cancer? How can early detection increase the chance of survival?

Which is a step of the scientific method in environmental science?

Why do many fishermen support efforts to protect and restore mangrove forests?

Science test 1. How do some hormones affect only certain cells in the body but not others? Only cells having specific receptors for a hormone can respond to the hormone's presence. The hormones only go to some cells in the body but not to others.

Which of the following statements describes a proton of an atom? A has a negative charge and is located in the nucleus. B has no charge and is located in the nucleus C has a positive charge and is located in outer energy levels.

What are reasons scientists use models? To study objects far away To study objects too large To study objects too small. To study objects easily found in a lab. To study events that take place over long periods of time.

1. true false Carbon atoms form the building blocks of most living things.

Inhibiting enzymes involved in cell wall synthesis leads to which of the following? A) cell death by osmotic lysisB) a reduction in protein synthesisC) the incomplete synthesis of the bacterial cell wallD) a reduction in the amount of usable energy

In the 20th century where did the most ecologically destructive oil spill in the US