The nitrogen cycle is carried out primarily by A. humans B. autotrophs C. bacteria D. fungi

After holding our breath briefly, what eventually forces us to take a breath? decreasing oxygen levels. increasing oxygen levels. decreasing carbon dioxide levels. increasing carbon dioxide levels. increasing blood ph.

Which weathering process is mechanical? A. Solution B. Carbonation C. Thermal expansion D. Hydration

S ome people believe that humans have always existed as the species we see today. Darwin created the theory of evolution. Which observation bolsters the theory of evolution? A) Humans have very diverse traits today.

What is nondisjunction

What hormone reduces blood pressure and blood volume by inhibiting nearly all events that promote vasoconstriction and sodium ion and water retention?

All fingerprints are invisble to the naked eye

These are organism that come from the same cell and are genetically identical to one another

The atmosphere will likely contain more carbon dioxide and less oxygen in the future A. if all coal burning power plants are replaced by wind turbines. B. if the rate of deforestation continues to increase. C.

8. What aspects of the experiment should Victor have held constant?

A tornado rips through the North Carolina mountains and destroys a huge forest. This decrease in the tree population is the result of a A) type of punctuated equilibrium. B) density dependent limiting factor. C) primary succession limiting factor.