I think the answer is D. ( or supported by observations ). Because theories change over time, they both NEED to be proven, they do NOT go off of consensus, but they do NEED to be supported by observations.
I hope this helps.
Answer: jet stream if im not mistaken
Explanation:
Answer:
D. organ systems
Explanation:
Organs and tissues that perform the same function are called organ systems
Answer:
I believe it's both C and D
