March 21st is an equinox. what part of earth is directly beneath the sun on that day?

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.

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

Describe the function of the endomembrane system? what organelles are involved?