Why does the heart separate the oxygenated and deoxygenated blood?

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.

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the