Answer:
A <u> theory </u> may be formed from many related hypotheses that have been tested and support the evidence.
Explanation:
<u>A THEORY -:</u> A theory is a well-established, tested explanation that gives some part of the natural world a unified description. A hypothesis is focused on substantiated knowledge, repeated testing, and a large community of scientists / researchers agree on it.
The aim of a theory is to try to understand phenomena that many researchers have examined extensively and carefully over time. A hypothesis does not prove that the "unified description is correct." However, because the theory is the result of scientifically based research, the theory (as opposed to a single hypothesis) is more likely to be correct. Any hypothesis can (and should) be tested, but many trained scientists must scientifically perform and study the experiments.
Here’s an example that I used when I was doing that— “Of the two pink monkeys in the world - one male, one female - the female dies, ensuring that there will never be a pure-bred pink monkey again.”
Answer:
A. The population of grasshoppers will be able to be sprayed with the pesticide and remain unaffected.
Explanation:
As mentioned in the question statement, scientist inserted a gene in a grasshopper population that encodes for immunity against a pesticide. Therefore, the grasshopper population would be able to survive well despite the pesticide is being sprayed. Principally, pesticide spray can kill the invertebrates such as grasshoppers. However, when the grasshopper has a gene that encodes for a protein that gives immunity against the pesticide, the effect of spray will be minimized. They will produce the immunity protein and this protein will help them survive in toxic conditions.
Other options are incorrect because:
- There is no need of training the grasshoppers to learn how to feed in areas where no pesticides are being used. In fact, insertion of gene that encodes for immunity would not help the grasshoper to get trained against the pesticide, rather, it will help providing immunity directly in the presence of pesticide.
- The gene provides immunity and has nothing to do against drought.
- It is not mentioned anywhere that gene is responsible for energy production and resistence against pesticide. Rather it is a gene that produces an immunity related protein.
Answer:
Commercial fishing by humans have a negative impact on the balance of organisms in an aquatic environment.
Explanation:
Organisms are present in balance numbers in both land and marine ecosystem. This balance is disturbed by human activities such as fishing and hunting. Commercial fishing by humans have a negative impact on the balance of organisms in an aquatic environment because one fish is the food of another fish. If fishes decrease in number in the marine ecosystem, many other species which feed on these fishes die because of hunger and the whole marine ecosystem is disturbed.