A) explain how animal respiratory organs have evolved to increase diffusion rates by manipulating these variables: distance of diffusion, concentration gradient and area for diffusion. b) for each variable, provide –and explain- an example of an animals that has maximized it the most. use a different animal group for each example.

What is thought to have caused the mass extinction at the end of the cretaceous period?

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.

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