How much of earths atmosphere is made up of nitrogen and oxygen? A. Less than 1 percent B. close to 99 percent C. 50 percent D. Between 24 and 75 percent

Quartz is quite resistant to weathering and is an important component of sands in riverbeds and on beaches. true or false

Name each part of the brain

What are three common complications from long-term diabetes? A. kidney disease, liver disease, central neuropathy B. lung disease, retinopathy, liver disease C. central neuropathy, heart disease, lung disease D.

Plants obtain phosphorous from: the atmosphere the soil animals

Why ocean ecosystems are more efficient than land ones

How does blood move through the body?

The sinuses are a defect in bone growth and have no real purpose. a. True b. False

How can growth of a population be slowed by its own numbers?

How are sessile leaves different from ordinary leaves?

8. In the S-Phase of the cell cycle; DNA is replicated. Why would eukaryotic cells need to replicate DNA before the nucleus divides? A. To trigger genetic transfer of DNA. B. To encourage rapid mutation rates in the organism. C.