Answer:
The ancestors of mammals diverged from ancient synapsids (reptiles).
Explanation:
The mammals have known to be evolved from a group of reptiles. These group of reptiles were known as synapsids. In fact, some scientists consider mammals as the only living synapsids. The close relativity between reptiles and mammals can hence be seen because they have common ancestors. The synapsids were known to inhabit the earth during the Permian Period.
The scientists, however, do not know from which reptiles exactly did the first mammals grow.
Answer:
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Explanation:
Tundra biomes are either found at high latitudes or high elevations in mountains. These are both very cold environments that are dominated most of the year by snow and icy conditions. This in itself tends to stunt plant growth.
These regions, especially, tundra in the high latitudes also have very short growing seasons (3 months perhaps) and so plants can only photosynthesize and store sugars for this amount of time. High winds in these environments also tend to keep plants low to the ground.
Answer A
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