An experiment showed that the growth of pillar coral decreased in warm
water in which other organisms blocked sunlight. which conclusion can be
made based on these data?
o
a. pillar coral are unable to eat or digest zooxanthellae.
o
b. pillar coral need sunlight so the zooxanthellae inside them can
make food.
o
c. pillar coral do not need zooxanthellae or sunlight to survive.
o
d. pillar coral need warm water so they can live free of
zooxanthellae.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

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.