Which two forms of life existed together on the earth during the same time period

Mastodons and flowering plants.

Explanation:

Hello,

In this case, mastodons or mastodonts belong to an extinct genus Mammut of the order Proboscidea; they were superficially similar, but at the time distinct from the woolly mammoth in terms of their blunt and conical shape of their teeth.

On the other hand, flowering plants or angiosperms are considered as the dominant and widest group of land plants reproduced by seeding. The flowers of flowering plants are the most remarkable feature that distinguishes them from other seed plants.

Now, it is known that among the following options:

a. dinosaurs and mastodons

b. trilobites and birds

c. flowering plants and trilobites

d. mastodons and flowering plants

Mastodons and flowering plants existed during the same period even when such flowers are still existing but mastodons don't.

Best regards.