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

What is the most significant challenge for organisms that live in estuaries

If you have 8 fish and 4 of them drown how many do you have left?

Which of the following best describes the muscles that line the digestive tract? A. striated: tubular; branched; voluntary B. non-striated; single nucleus; involuntary C. striated; tubular; multinucleate; involuntary D.

Which kind of wave would be observed in outer space between planets, where there is very little matter? A. An electromagnetic wave, such as an x-ray B. An electromagnetic wave, such as a sound wave. C. A mechanical wave, such as an x-ray. D.

Burning fossil fuels increases the amount of carbon in the atmosphere A. True B. False

During the light reactions, what structure is responsible for absorbing the solar energy? Question 1 options: A) chloroplast B) stoma C) stroma D) bark of the tree

What is the name of an alcohol derived from hexane?

Your neighbor collapses in the yard and has a generalized tonic-clonic seizure. your first step in treating this victim is to:

Which of the following is an example of homoplasy? (A) hair in humans and fur in mice (B) astragalus ankle bones in hippos and deer (C) Hox genes in humans and flies (D) streamlined bodies in dolphins and ichthyosaurs

At its peak, the Roman Empire encompassed a land area that included present-day A. China B. Poland C. Spain