Most of today's environmental problems began during which period (s) in human history?

6. The organic compounds in living things are organized into groups: carbohydrates, lipids, proteins, and nucleic acids.

Jane and Sarah both dive down from the surface of a pool. Jane first dives down 5 feet, and then dives down 3 more feet. Sarah first dives down 3 feet, then dives down 5 more feet. A.

Name two nutrients that are recycled through an ecosystem.

Humans can force natural selection. true or false

A water module is compressed of two hydrogen atoms and one oxygen atom arranged in a bent shape since oxygen is significantly more electronegative than hydrogen this unequal sharing of electrons and bent shapes result in water being called a a.

The root of the tooth is held by the periodontal ligament a. True b. Falsee

At the center of the Andromeda galaxy is a source of x rays that scientist believe is a black hole with how many more times than the sun

True or false? The more similar two organisms are, the more distant their common ancestor is.

The blood-brain barrier a. is fully developed in humans when they are born. b. prevents many drugs from entering the brain. c. is designed to allow all drug compounds into the brain. d. cannot be penetrated, even with trauma to the brain.

Which is another name for observations? Models Predictions Data Inferences