The coelacanth is a kind of fish that has existed for 400 million years.
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Image by Aberto Pemandez Femandez. 2007
Reproduced under the terms of the GNU Free Documentation License Version
The modern day coelacanth is almost identical to its Paleozoic ancestors. How has the evolution of this species most likely
progressed?
A. It has experienced long periods of stasis in which little change has occurred.
B. It has evolved convergently to fill a specific niche in its ecosystem.
C.
It has changed gradually over time into a completely different species.
D. It has experienced gene flow from a separate population which has drastically changed its genetic make-up.
changed its genetic maken

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.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.