"Some plants called epiphytes, or air plants, have adapted to get nutrients from the air.
Some examples of epiphytes in rainforests are mosses, lichens, and orchids. Although
they often live on other plants, they don't take any nutrients from the other plants-they
get what they need straight from the air with special root systems.
There are also some plants called parasitic plants. They grow on other plants, their host
plants. Parasitic plants actually DO take nutrients from their host plants."

Why might the author have capitalized the word "DO"?
A. to point out a similarity
B. to make a contrast
C. to summarize a process
D. to make an argument

B.

Explanation:

Prior to the parasite lines, he mentions that epiphytes do not take nutrients from other plants, therefore, by capitalizing the word "do" he is creating emphasis on the contrast between his two statements about plants.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.

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