First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst. hope this helps :)
Long answer short- to reproduce cells.
Answer:
B. The deer population increased
Explanation:
Wolves would primarily hunt the deer, therefore if there were no wolves around then the deer were able to reproduce without the threat of wolves eating them.
Wolves wouldn't hunt bears because it is increasingly harder for them to kill bears than deer.
The wolves wouldn't really influence the environment because they are mainly carnivores.
<em>Hope this helps!!</em>
<em>- Kay :)</em>
The correct answer is - C. Humans.
The stickleback in Loburg Lake, Alaska, is not a native species of the lake. It is thought that this fish was introduced to this lake somewhere between 1984 and 1989. The reason for this kind of suggestion is that the stickleback in this lake had full armor like the stickleback in the seas, which is not something found among the lake populations of this species. Also, the full armor had gradually been reducing with each new generation, and in the present, the stickleback in this lake looks totally the same as the other lake populations.
The stickleback did not had any predators in Loburg Lake, thus the losing of the full armor as it was not needed, instead the stickleback was the predator. But even though it didn't had a predator in the water, the humans became its predator through the recreational fishing that takes place on this lake.
Answer:
Plants
Explanation:
In animal cells the division of cytoplasm is by constriction of the cell membrane. But in plant cells a cell plate forms within the cytoplasm and grows to separate the cell into two. The cell division in plants is completed by cytokinesis.
