What do the arrows on a food web or food chain indicate?

In the african savanna,more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

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.

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?