Akey difference between green algae and land-based plants is that a. land-based plants don't have vascular tissue and must absorb nutrients directly from the environment. b. green algae don't have chloroplasts and absorb their food rather that perform photosynthesis. c. green algae don't have vascular tissue and must absorb nutrients directly from the environment. d. land-based plants breath in carbon dioxide while green algae consume oxygen.

The correct answer is option C.

Explanation:

Green algae lack the vascular tissues, that is they do not have phloem or xylem for transporting water and nutrients throughout their bodies. They have a thalloid that means they do not have a body divided into root stem and leaves. The thalloid body helps in absorbing nutrients from surroundings.

The land-based plants have xylem and phloem (vascular tissues) to transport water, nutrients, and minerals throughout the body.

Thus, the correct answer is option C.

a covalent bond, specfically triple bond