An important principle scientists follow to determine ancient climates is:

ALarger plants and animals require warmer climates.
BIf an organism today needs certain conditions to live, then a similar organism that lived in the past needed similar conditions.
CEarth was warmer long ago, so the climates were too.
DClimatic changes today occur faster than in ancient times.

B. If an organism today needs a certain conditions today, then a similar organism that lived in the past needed similar conditions.
That is the answer.

Answer Link

eurydike eurydike · Answer 2 · 2019-03-29T10:14:24-04:00

The correct answer is option B, If an organism today needs certain conditions to live, then a similar organism that lived in the past needed similar conditions

Reason-

The evolution of a species is linked to the climatic conditions faced by it in the past. If scientists are able to estimate the climate conditions by analyzing the fossil remains of species of a particular time period in which they survived, they are able to relate it with the climatic conditions of today. Species which survive is a specific climatic condition if remain un evolved shall need the same climatic conditions for-ever irrespective of the time period.