1. In most chordates, what does the notochord become? the brain
the appendages
the backone
the spinal cord
2. In most chordates, what does the notochord become?
the brain
the appendages
the backone
the spinal cord
3. Which of the following is not a chordate?
Human
Elephant
Sea squirt
Sea star

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs