Species that are multi-celled, have nuclei, and photosynthesize can be found only in

Explain the significance of the increased cell specialization of the volvocine line

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

What materials must dams have to produce electricity, and what must occur?