Green algae and land plants share three characteristics. They produce their own food through photosynthesis, they have eukaryotic cells that contain chlorophyll, and they have cell walls made up of cellulose.
Explanation:
Green algae and land plants have a lot of similarities like both their cells are eukaryotic and have nucleus, mitochondria and other cell organelles and contain chlorophyll (prepare own food by photosynthesis).
The cells of green algae are covered by a protective cell wall which contains a polymer similar to that of the land plants cell wall containing cellulose and/or glycoproteins. This cellulose is a polysaccharide carbohydrate.
The presence of cell wall in green algae proves that they are the closest relative or ancestors for land plants.
