The reactants when fossil fuels are burned are shown below. what are the
products of this reaction?
fossil fuel + oxygen gas → ?
o
a. carbon dioxide + fossil fuels
b. water + heat
o
c. nitrogen gas + heat
o
d. carbon dioxide + water + heat
!

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.

What causes darkening of the skin as melanin production increases

All organisms contribute some water to the water cycle by conducting