What did griffith observe when he injected a mixture of heat-killed, disease-causing bacteria and live harmless bacteria into mice? a. the disease-causing bacteria changed into harmless bacteria. b. the mice developed pneumonia. c. the harmless bacteria died. d. the mice were unaffected.

Amouse that is homozygous for the dominant trait has the genotype . it has . a mouse that is homozygous for the recessive trait has the genotype . it has . image of fur color of mice

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

How do you date a sample of rock that you suspect as being one of the earliest on earth