What type of invertebrate are robber crabs

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

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 -