Need answer 20 will give branliest which one of these exhibits a dorsal nerve chord at some stage of its development? a snail a grasshopper a lancelet a jellyfish

Easy 6th grade work! 100 points! i need fast! compare the parts of a cell and the cell as a whole to another common nonliving system (i. e., a car, a city, describe the parts of a cell and their primary function.

Are the layers of rock above and below the coal older or younger?

Which of the following correctly matches an immune system cell with the defense it produces? a. b cells release cytotoxins. b. t cells release cytotoxins. c. b cells absorb antibodies. d. t cells absorb antibodies.