Answer:
Innate immunity you are born with.
Acquired immunity you need to work on over time
Explanation:
Poison ivy for example. Come people are born immune to it, while others have to be around it a lot, (agonizingly so), and they will build up immunity to it's poison.
Liters/cl/ml/dl for liquids and cubic meters/cm/mm/km for solids
Answer:
Nocturnal animals are important pollinators. What niche do they specifically fill? They eat the nectars of angiosperm flowers.
Explanation:
It would be Carbon Dioxide.
I'm assuming that you want us to tell you what organism does these things. So it would be a plant.