Answer:
Sea otters affected biodiversity because they control the populations of sea urchins, which endanger kelp forests. Kelp forests are important because they convert sunlight to living material, and they also provide food and habitat to sea creatures. Kelp is important in sustaining the diversity of ecosystems. Additionally, sea otters may also be accountable for the large size of abalones in California.
1 and 3 is right. 2 and 4 aren't really true.
Answer:
Food (Carbohydrates)
Minerals (Stored in fruits from the soil)
Oxygen
All of these are not part of the life cycle. It's man-made. Think of it in biology terms - something that's created genetically.
