How many chambers does the amphibian heart have?

Refer to the figure.        According to the figure, how does the amount of nitrogen entering the atmosphere from human activities compare with the amount entering from land-based natural sources? (All values are in units of 1012 grams.)

Roots and shoots lengthen through activity at ________.

The most common usage for the pilus in bacteria is to:

The structure of the cartilaginous and body fishes that detects vibrations in the water is the

The geographic distributions of wolves and coyotes often do not overlap. A study of wolves and coyotes in an area where they do overlap found that the two species minimized competition by differential use of food resources. Wolves preyed primarily on elk and a few deer, whereas coyotes preyed mostly on deer and rarely on young elk. Coyotes also scavenged abandoned wolf kills. Wolf and coyote behavior illustrates which type of competition?

Which BEST describes why it is important for us to understand how things are measured with the SI system?

Fungi are like algae in that fungi are classified primarily on the basis of their colors.

An example of a trait controlled by multiple alleles is  

A large area is deforested and remains bare. The loss of evapotranspiration from this forest will likely leave the regional climate