Testosterone<span> begins the development of secondary sexual characteristics.</span>
Photosynthesising primary producers require sunlight. Therefore, in the ocean, phytoplankton would be concentrated within the surface layers of the ocean where the sunlight penetrates. Phytoplankton support a wide range of marine life: zooplankton feed on phytoplankton, which in turn support fish and so on.
Answer:
a regulated movement of the plant hormone auxin known as polar auxin transport.
