Which was the original source of atmospheric oxygen? Question 4 options: autotrophs cooling of Earth's crust formation of the oceans volcanoes

The brownish haze over communities where substances produced when hydrocarbons, nitrogen oxides and other small particulate matter chemically interact in the presence of sunlight is referred to as

1. Which one of the following accurately pairs the blood vessel type with its function? A. Capillaries - work to exchange gases and nutrients with tissues B. Arteries - carry blood to the heart C. Veins - carry blood away from the heart D.

Fungi are not considered plants because They have cell walls They contain pigments They cannot make their own food They have roots

Which life activity is not necessary for the survival of the individual organism

Which organisms of the Archaea domain live in really salty environments? A. halophiles B. thermophiles C. methanogens

What is a inorganic compound in a living cell

What impact does thunderstorms have on people and the environment?

Whats the difference between purine and pyrimidine?

The steps in which solar wind is formed

What extends from earth core to earths crust