Scientists are studying how a particular molecule gets in and out of cells. they add a large quantity of the molecule to the cells' external environment and note that the substance moves into the cells. if they inject the substance directly into the cell, they find that it cannot get out.

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

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?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?