Many scientists believe that the current period of global warming is related to increased levels of
a. carbon dioxide in the earth's atmosphere.
b. radon being released from the earth's soil.
c. nitrogen in the earth's atmosphere.
d. hydrogen in the outermost layer of the earth's atmosphere.

Bottle deposit programs are one way to encourage higher recycling rates. explain how they work

70 pts answer the following questions in full sentences and paragraphs, using at least 150 words, in the essay box below. 1. which organisms are carnivores? herbivores? omnivores? 2. if the ecosystem is balanced, which populations should be the largest? the smallest? 3. imagine a group of hunters kills half of the rabbit population. how will the other organisms be affected? 4. imagine disease kills 85 percent of the wolf population. how will the other organisms be affected? 5. imagine a foreign mountain lion species is introduced into the ecosystem. how will the other organisms be affected?

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire