Which of the following chemical equations is balanced?

A. H2 + Cl2 4HCl

B. 4H2 + 2O2 2H2O

C. 4Fe + 3O2 2Fe2O3

D. 2Fe + HCl FeCl2 + H2

Ants and aphids often live near each other. the ants feed on wastes produced by the aphids, and the aphids are protected from predators by the presence of the ants. what type of relationship is this?

Why are rivers less productive than swamps? The water flow n rivers is too high

Why was it important to determine the structure of DNA to understand how DNA stored, copied, and transmitted information?

Why is drinking water usually treated before it comes out of your faucet?

The sensory receptors for the kinesthetic sense send information to the brain about the head's position and movement. (true or false)

Which vessels allows for oxygen movement into the tissues

What is the difference between a physical and a chemical change

What is described by binary fission? A) The way prokaryotes move. B) The way prokaryotes produce energy. C) The way prokaryotes reproduce. D) The way prokaryotes digest nutrients.

There are many different ecological and environmental conservation methods. Which is not a conservation method? A) water harvesting B) fishing seasons and limits C) limiting of clear cutting of forests D) wind and wave erosion on coastal areas

Explain when and how dire wolves became extinct.