Why do autotrophs always occupy the lowest level of ecological pyramids?

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes