Plants evolved from ancestral algae that were multicellular, photosynthetic, and aquatic.
Over time, plants adapted to survive the dry conditions on land.
- Nonvascular plants lack efficient internal transport of fluids; sperm swim to eggs.
mosses live in damp habitat and are small.
- Seedless vascular plants have vascular systems for internal transport.
ferns can live in drier soil.
- Gymnosperms produce seeds but not flowers or fruits; sperm travel to eggs via pollen tubes.
pine seeds are enclosed in cones.
- Angiosperms produce flowers and fruits that contain seeds.
grasses and forbs are adapted to arid conditions on land.