Plants first appeared on land nearly 500 million years ago. Since these first colonizers, there have been three key developments that allowed plants to diversify & colonize an immense range of habitats. Put these three key developments from the following in in the order in which they evolved, oldest to newest:

a. Cellular respiration
b. Seeds
c. Vascular tissue
d. flowers cels
e. Photosynthesis
f. Specialized Cell

C. Vascular tissue, B. Seeds and then D. flowers

Explanation:

The land plants were evolved from the aquatic plants especially algae named Chara.

The land plants adapted to survive on the terrestrial habitat by forming structures first of which is the vascular tissues.

The vascular issues developed in the trees in the group of organisms called the pteridophytes. Later plants started protecting their embryos in a hard coat layer which could protect the embryos during adverse conditions. These structures were later called the seeds which were a characteristic feature of the gymnosperms. Later plants developed the flowers which acted as modified reproductive structures and the plants were called angiosperms.

Thus, C. Vascular tissue, B. Seeds and then D. flowers is correct.

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