David shows delayed intellectual development and has flattened facial features. the doctors explain that this genetic disorder is a result of extra genetic material in the 21st chromosome. which disease is david suffering from?

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.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

The tubes transporting minerals and water upward are called ?