2. which statement is true for a chemical change? a. of the substance is not changing. b. mass is conserved c. the substances always changes from solid to liquid.

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 pattern of migration do whales follow?

Brainliest ! which would require more force to move or slow down between a bowling ball and a soccer ball? explain why?