Which of the following occurs in the upper respiratory system?

A) air enters the alveoli

B) air enters the bloodstream

C) air is filtered and moistened

D) air is delivered to muscles

The year graphs shown below represent hours of daylight and solar energy for what location?

An introduced species that's sometimes harmful to the prairie chicken (native species) is

Which of the following types of waves has more energy than an x-ray?

3. How many "years" separate the dinosaurs from humans on Earth?

Explain why DNA is called a molecular clock.

Rangers tagged and released 255 salmon into a Maine lake. A month later, fishermen on the lake were surveyed. They reported catching 60 salmon, 20 of which had tags. Using this sample, estimate the salmon population in the lake.

In humans, having dimples in the cheeks is a dominant trait. if a child has dimples but only one of her parents does, what are the genotypes of her parents? (d = dimples; d = no dimples)

How would new traits in an insect species develop?|

How can fertilizers used on lawns and fields affect a lake?

An organism inherits it's genetic material from it's- 1. offspring 2. food source 3. parents 4. environments