What does 0.3 with this little - thing on top of 3 means

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere