What is a negative feedback loop? a) the output of a system stimulates another cycle of the system
b) something that carries out a response
c) anything that causes a reaction or response
d) a closed path that tends to reduce the activity of a body system

Is snow a type of precipitation? explain why or why not.

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.