What are the eye spots on the head of a flatworm used for?

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

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