You are building a lego model of DNA. So far you decided. . . A red lego will represent adenine (A). A green lego will represent guanine (G). An orange lego will represent thymine (T). A blue lego will represent cytosine (C). If you use 30 red legos in your DNA, you will also use 30 legos of which color? - Red

- Green

- Orange

- Blue

My teacher always taught me the saying "(A)pples on (T)rees, (C)ars in (G)arrages, meaning that A always went with T and C always goes with G

When that applies here, 30 Red, or Adenine legos would go with 30 Thymine legos, which is the color orange

30 reds would go with 30 oranges in this case

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.