Name the two gases that are exchanged when someone breathes.

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

What was the land like over 500 million years ago? what was under the sea?

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a. earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c. earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.