A student encounters a pondweed which, judging from its appearance, seems to be a charophyte. She brings a sample back to her biology lab. Using only a compound light microscope to study the sample, which of the following features should help her to determine whether the sample comes from a charophyte or from some other type of green alga? 1.molecular structure of enzymes inside peroxisomes 2.structure of sperm cells 3.presence of phragmoplasts 4.rings of cellulose-synthesizing complexes

The Kingdom Plantae first appeared about 410 million years ago when green algae transitioned from water to land. The differences between land and sea posed a challenge to early colonizing species, which prompted many new adaptations. These adaptations have resulted in the wide variety of plant forms observed today.

There are an estimated 250,000 species, with the greatest diversity in the moist tropics.