the respiratory system includes organs like the nose, throat and lungs. Which of these diseases directly affects the respiratory system?

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Ectocarpene is a volatile, sperm cell-attracting material released by the eggs of the seaweed ectocarpus siliculosus. its constitution is all the double bonds are cis, and the absolute configuration of the chirality center is s. draw a stereochemically accurate representation of ectocarpene.

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior