Answer: The answer is federal employees
Explanation:
Answer:
People with the sickle cell mutation in both copies of the HBB gene produce proteins that clump together and lead to changes in the shape and behavior of red blood cells.
The Arenal Volcano in Costa Rica
In an experiment, independent variables are those which are changed or manipulated to find the value of dependent variables. Here number of roses is dependent variable because its number depends on how many aphids are present. So option A is incorrect. Kinds of aphids killed is also dependent variable, because its population depends on how much chemical is sprayed to kill it. So, option C is also incorrect. Kind of rose is irrelevant, because aphids will eat any kind of rose. So the right answer is - <u>Option B, kinds of chemicals used</u>. This is because it will determine the number of aphids left and population of roses.
