Which two types of matter are chemical pure substances

Explain how living things recycle oxygen in earth's atmosphere.

What is an ice age? A) a recent increase in the average global temperature near Earth's surface B) a period of time when temperatures across the planet are colder than normal C) a characteristic of winter that returns seasonally D) the loss of heat

What is Holmes reaction to Dr. Roylott?

If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be a. 0.25x. b. 0.5x. c. x. d. 2x.

An abiotic factor that Could be studied by an ecologist visiting africa is the

What do scientist study to see the genetic changes that occur through generations

What makes pelicans and penguins different? a. pelicans are flightless birds. b. pelicans spend about three-quarters of their lives in the water. c. penguins have large bills with a loose and elastic pouch. d. penguins have wings shaped for swimming.

What is likely to happen if you only offer generic attributes and qualities as examples of your qualification for a position?

When organisms convert forms of energy what usually results

The transmission electron microscope is most useful for Looking at surface details of a virus Viewing a cell's mitochondria Seeing animal tissue that is visible to the naked eye Studying the structures of a live paramecium I think it might be the