It's C.
All chemical reactions will always need activation energy.
The answer is the anther because an ovule and an ovary are female reproduction parts and a pollen grain does not produce sperm nor is it hard.
Answer: pancreas- secretes enzymes
Gall bladder- stores bile
Liver:makes bile
Salivary glands: found in mouth
Explanation:
The factor being tested is the variable. There are two types of variables, independent and dependent. The independent variable is the factor being changed by the scientist or the person controlling the experiment. The dependent variable is the thing that gets changed due to the changing of the independent variable. The dependent variable cannot be changed physically by the person doing the experiment.
