Match each term to the appropriate description. E:
community
a single orca whale
population
allorca whales, fish, seaweed, islands, and
the Pacific Ocean
ecosystem
allorca whales, fish, and seaweed living in
one area
species
a group of orca whales living along the Gulf
of Alaska
organism
all orca whales in the world

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.