Answer:
B. Humans will have less salmon available to eat.
Explanation:
First off, you always want to be wary of choices that are kinda extreme. Take for example, choice A., which says All of the oxygen in the atmosphere will disappear. The problem doesn't say that the plankton population will go extinct, just decrease, so oxygen from the atmosphere won't completely disappear. There are also other sources of oxygen. Moving on, C. says that the shrimp will completely disappear from the sea. This is wrong because once again, plankton won't go extinct in the problem. The shrimp population will decrease but not go extinct. Next, D. Choice D is baloney because a decrease in plankton means less food for salmon, which means the salmon would die in the area. That leaves Choice B. Choice B. makes sense because of something called the bottom-up model, which states that an increase or decrease in the amount of organisms in a lower trophic level will affect the organisms in the above trophic levels. We can see that in action here; if the amount of plankton drop, the amount of shrimp salmon will drop, which means less salmon for humans.
Answer:
The intensity of density-dependent factors increases.
Explanation:
Answer:
The correct answer will be option-A
Explanation:
A scientific experiment is designed in a way that it tests the predicted hypothesis and so contains the three different types of variables namely: independent (can be modified), dependent (to be studied) and the control (kept constant and unchanged).
In the given question, since the scientists studied the effect of nitrate and phosphate in which he provided the plant samples with nitrate and phosphate but he missed the control sample which should lack the variable to be tested that is nitrate and phosphate. This control variable helps the scientist to study the relationship between other samples.
Thus, option-A is the correct answer.
A pathogen or infectious agent would be a parasite, fungi, bacteria or virus that is bad for our health. One type of pathogen or infectious agent would be the common cold. You can prevent the spread of the common cold by washing hands with antimicrobial soap often and staying away from others who are sick. Doing this would greatly reduce the chance that you'd get sick, too.