How many of Earth's plant species are used as agricultural crops?

A)

1,000

B)

3,000

C)

5,000

D)

7,000

E)

9,000

Which part of the brain is responsible for combining sounds into words and arranging words into meaningful sentences?

The world's population has been growing exponentially. Some scientists consider the effects of human population growth a tragedy of the commons. What is the common resource in this example? A. Privately owned land B. Planet Earth C.

The oxidation of sucrose (sugar) into CO2 + H2O can occur quickly or slowly. Which of these modifications to the reaction is likely to cause the reaction to speed up the most?

Match the zone to its characteristic A. Tropical [Hot in the summer, cold in the winter] B. Temperate. [Has highest insolation] C. Polar.[Has lowest insolation]

Explain why detritivores, decomposers and omnivores are not assigned trophic level

Water and soil pollution from oil and gas drilling is primarily what type of concern?

In the DNA chain the nitrogenous base adenine is combined with

Where would you find a stargazer? What did the Greeks call them and why? What do stargazers have to stun their prey? - What other mechanism do they have just behind the operculum and above the pectorals?

Gregor Mendel carried out a cross between two pea plants by taking pollen from a plant that was homozygous for round seeds and dusting the pollen onto the stigma of a plant homozygous for wrinkled seeds.

4 reasons why global warming is a problem