What is a chemical defense associated with the first line?
Sweat
O Mucus
O Tears
O
Saliva
O All of the above

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine

What are the three different shapes, or structures, of carbon-based molecules