Scientific theories, such as the theory of evolution, must be

a- neither testable nor observable
b- testable and observable
c- observable
d- testable

hope this !

the wires in the toaster turning red and the toast crisping and turning brown

answer///multiple alleles;

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.