Answer:
D. They increase soil nutrient levels
Nitrogen fixation is the conversion of nitrogen gas into a usable form.
Answer:first option
Explanation:
If the females only give birth to 1-2 offspring per litter, it would take longer to keep the population alive due to the low ammount of babies being born (you have to concider that some babies don't survive to adulthood though)
sunlight. It's the highest thing on the food chain, therefore all living need it, and get a lot of it