Soon after nerve growth factor (ngf) was discovered, investigators injected newborn mice with antibodies that inactivated it. compared to control mice, those that received the antibody showed massive amounts of nerve cell death. after a week of daily antibody injections, up to 99% of the neurons in certain parts of the nervous system of these mice were gone. what do these results suggest

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.

The influenza virus cause the flu, but not other diseases. why?

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms