By analyzing spectra what can astronomers figure out about planets

Which of the following is true regarding extinction? a. Extinction that occurs in a relatively short period of time is referred to as background extinction. b.

Salt water is an abundant resource but unusable for irrigation and drinking. As demands on freshwater sources increase, the use of desalination processes to remove salt from ocean water is increasing.

4. If a scientist is observing biotic and abiotic factors, which of the following level of organism must she be studying? A. An ecosystem B. A community C. A population D. An individual organism

What is a limitation of using electron microscopes to view specimens? A. Resolution is weak and cannot make out details of very small specimens. B. Electron beams are dangerous and can only be used sparingly. C.

In a given hybridization between two flowers, red "R" is dominant, and white "r" is recessive. In a cross between two white-flowered plants, what statement would BEST describe the offspring?

Why is it necessary to liquefy air to separate its components?

Select all that apply. Which of the following are vertebrates? starfish earthworms tunicates crab amphibians lancelets octopus grasshopper

What do scientist use to represent evolutionary time

The cytoskeleton is a membrane bond organelle. A True B False

An epidermal layer found only in the skin of the palms of the hands and the soles of the feet is the