Mutualism is where both animal help each other to benefit form each other. Win-Win . Commensalism is where nothing happen neither animal benefits from it .
Answer:
Number of wolves, and harshness of winter.
Explanation: I took the test
B. larger and more complex
Explanation: As the environment became more unpredictable, bigger brains helped our ancestors survive.
A prothallium, or prothallus<span> is usually the </span>gametophyte<span> stage in the life of a </span>fern<span> or other pteridophyte. Occasionally the term is also used to describe the young </span>gametophyte<span> of a liverwort or peat moss as well.</span>
