Will give ! : )

answer this question about trilobite. these animals were once present in the ocean but are now completely extinct. what is a likely cause of tribulation extinction?

a) they failed to develop vestigial organs that would have them survive

b) they were no longer able to acquire the necessary characteristics for survival in a changing environment.

c) something changed that brought these creatures onto land in a slightly different form.

d) something changed to limit and finally abolish their success in this environment.

Which technically is nasa developing that will astronauts reach mars

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.

This is the amino acid cysteine. circle the amine group, put a box aroundthe carboxylic acid group and use a different colored pencil/pen to circle the sidechain (r group). h o | ||nh2— c- c-oh | ch2 | sh