Pretty sure that the endocrine system is represented by the diagram
So the answer is endocrine
Answer
A.
Explanation:
All of them have an a and only two have a B. Thats my best guess
Answer:
A testable question is one that can be answered by designing and conducting an experiment. The answers to a testable question can be observed and measured. Hypothesis- a testable explanation of an observation. A hypothesis is NOT just an educated guess about what you think will happen.