Stromatolites are

a type of fossil dinosaur
produced by cyanobacteria
the earliest mammals
the earliest fossils
found as early as the archean era

b) the inside picture would look at a very high temperature in a very low ph

well, since there is no answer choices, i will give an answer on how it works : )

the two objects are placed together. energy will always be transferred from the hotter object to the cooler object until they are equal. hope this is close to one of the answer choices : )