7. When two or more elements are combined, the substance produced is a I A. suspension
B. transitional metal
C. compound
D. noble gas

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Slow down transpiration by the stomata question 9 options: a guard cells; closing b chloroplasts; closing c guard cells; opening d chloroplasts; opening

This diagram shows how seed plants are grouped. which is the missing label? bryophytes angiosperms pteridophytes monocots