How could an abundance of algae have a positive impact on an ecosystem? 1Algae grow very quickly. An abundance of algae would cover the surface of the water and provide shade for aquatic organisms.
2Algae provide carbon dioxide for many aquatic organisms. An abundance of algae would result in more available carbon dioxide.
3Algae is the food source for many aquatic organisms. An abundance of algae would mean more available food.
4Algae is a primary consumer. More algae would result in a more balanced ecosystem.

Algae is the food source for many aquatic organisms. An abundance of algae would mean more available food.

Explanation:

just cause

the missing space is phylum

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.