Science virtual lab: smithsonian museum of natural history

foosil tracks: an unknown animal made these strange chervon-shaped tracks half a years ago on the rippled sandy floor of a shallow sea.
a) hundred
b) billion✔
c) thousand
d) million

fossil tracks: the animal's track pattern has been named "climatichmites."
no animal leaves similar track patterns.
a) modern✔
b) old
c) big
d) small

the fine art of filter-feeding. the filter-feeder is limited to "soupe du jour"- a brother of small and organic particles suspended in sea water.
a) boys
b) girls
c) organisms✔
d) animals

the fine art of filter-feeding. competition for food has much to do with where brachiopods and crinoids live. by positioning themselves at different in the water and choosing food particles of a particular size the animals stake out niches themselves.
a) times
b) heights✔
c) temperatures
d) colors

filter-feeders move into the spotlight. brachiopods look like
a) fish
b) kids
c) clams✔
d) animals

filter-feeders move into the spotlight. crinoids are looking animals.
a) scary
b) cute
c) rock
d) flowery✔