Answer: (A) The conclusion is valid because the independent and dependent variables in experiment were controlled.
Explanation: There are some basics requirements in order for an experiment to be valid: hypothesis, monitoring, independent and dependent variables and constants.
The personal characteristic that the patient is
demonstrating is hardiness—this personality characteristic focuses more on the
person’s way of handling the things around her such as stressful problems that
arises in his or her life and whether how they have the sense of control in
handling the issues.
Animals, they only have a cell membrane, not cell walls.
I don't know what the answer choices were, though, but I hope this helps.
If vegatation were to decrease then primary consumers that are herbivores which are usually the prey will start to decrease too, because there food source is becoming limited. It's like a domino effect, if something is unbalanced in the ecosystem then the whole ecosystem could collapse.
Answer: a cell wall
Explanation: a cell wall is a barrier that protects the plant cell. Animal cells do not need this becuase they have a cell membrane which also protects the cell.
