Within six months of effectively using methicillin to treat S. aureus infections in a community, all new S. aureus infections were caused by MRSA. How can this best be explained?

A) A patient must have become infected with MRSA from another community.

B) In response to the drug, S. aureus began making drug-resistant versions of the protein targeted by the drug.

C) Some drug-resistant bacteria were present at the start of treatment, and natural
selection increased their frequency.

D) S. aureus evolved to resist vaccines.

Pretty sure it’s C, but I’m not sure.

Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called a. shield volcanoes. b. cinder cone volcanoes. c. composite volcanoes. d. lava plateaus. select the best answer from the choices provided a b c d i need asap

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

Svetlana and her mother are very similar. both have blonde hair, a love of scrapbooking, blue eyes, and a thin nose. which statement  most likely  describes svetlana’s traits? svetlana inherited her love of scrapbooking from her mother, but her blue eyes come from her environment.svetlana inherited her blue eyes from her mother, but her love of scrapbooking comes from her environment.svetlana inherited her thin nose from her mother, but her blonde hair comes from her environment.svetlana inherited her blonde hair from her mother, but her thin nose comes from her environment.