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Huge leaves with humongous surface area.
Humans! (thats it)
Various aquatic reptiles were predators of ammonites. Fossils of damaged ammonites have been found with teeth marks from Plesiosaurs.
produce more eggs
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No. Cephalopods like nautilus, squid, cuttlefish, and octopus have no skeleton, just one long piece of cartilage.
The frog has many adaptations allowing it to have an aquatic way of life. These include webbed feet, gills, strong legs, and wide eyes.
allow them to obtain oxygen from the air, such as aerial roots.
Most aquatic animals living in cold climates can survive quite nicely thanks to their adaptations. Some animals have hair and others like whales have a tremendous amount of blubber that helps to insulate them from cold temperatures.
Boatsman insects eat aquatic plants, algae, and a few aquatic larva of other species. Backswimmers which look very similar, are predators and have a mean bite.
http://startrek.wikia.com/wiki/Kharah this site provides a little information on kharah. apparently it was aquatic predators.
Because of the relative longevity and reproductive capacity of predators vs. plankton