Consider the evolution of chordates, organisms with a hollow nerve chord. choose the organism most closely related to humans.
a)
lamprey
b)
sea star
c)
lancelets
d)
brittle star

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

Using meiosis, the sporophyte produces spores that are .