Earths tropics have the most diverse ecosystems because they have

a. the most invasive species

b. very little competition

c. stable levels of moisture

d. many primary disturbances

What sugar does RNA have that is different from the sugar in DNA?

Which of the following best characterizes the factors that have contributed to the "dead zone" in the waters of the Chesapeake Bay for the past few decades? A. fertilizer runoff from farms, animal manure, and stormwater runoff. B.

Which of these is a prokaryote? a. fungi b. protist c. plant d. bacteria

What do safety symbols look like? what do they mean? provide at least three examples.

The body uses two types of amino acids: essential and nonessential. Which of the following statements about essential and nonessential amino acids is correct? There are 11 essential amino acids.

What is the primary storage form of carbohydrate in the body?

Why are algae considered to be the ancestors of land plants?

A number of systems for pumping ions across membranes are powered by atp. such atp-powered pumps are often called atpases although they don't often hydrolyze atp unless they are simultaneously transporting ions.

1. Data for which of the following variables is placed on the x-axis of an x, y scatter graph? control independent untreated dependent

How seeds are an effective adaptation to ensure reproductive success