Why does the government not do more to regulate nonpoint source pollution?
a.
nonpoint source pollution is less harmful to the environment, so it does not need to be regulated.
b.
point source pollution is more common than nonpoint source pollution, so it is more regulated.
c.
nonpoint source pollution is caused solely by animals, which are not possible to regulate.
d.
nonpoint source pollution is difficult to regulate, because its source is difficult to track.

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c