AP BIOLOGY

Detailed explanation-1: -As the most common freshwater cyanobacterial genus, Microcystis is a unicellular microorganism, with high phenotypic plasticity, which forms colonies and blooms in lakes and reservoirs worldwide.

Detailed explanation-2: -Hornworts differ from other bryophytes in having a region of continuous growth at the base of the sporophyte, and a large irregular foot. The stalk that attaches the foot to the spore-bearing capsule in liverworts is absent in hornworts.

Detailed explanation-3: -The ability of hornworts to store carbon dioxide (CO2) for later use in photosynthesis also sets them apart from liverworts. Hornworts generally live in wet, humid places. Within this habitat requirement, they can be found on rocks, in soil, or on tree bark, but they do need the humidity to survive.