In an aquatic ecosystem, the algae and phytoplankton are responsible for primary productivity. all but one factor
usually influences the primary productivity of a marine ecosystem. that is
water salinity
light intensity.
water temperature.
available nutrients.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

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