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Hello. I've done well with everything else, but I'm stuck on the following:

1. Herring are salt-water fish. They

A - need to expel large amounts of water to offset osmosis
B - need to take in large amounts of water to offset osmosis
C - slowly dehydrate over the course of their lives
D - slowly swell up over the course of their lives

2. Some species of lungfish breathe only air; they have no gills, and will drown if forced underwater. Why might it be an advantage for lungfish to breathe air even though they live in water?

3. Bar-headed geese fly over the world's highest mountain range, the himalayas, at heights of 25,000 feet. What adaptations do you think they have which allow them to fly so high?

Muchos thanks in advance!

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