Treponema pallidum is the bacterium that causes syphilis. the gram-negative spirochete has never been cultured on bacteriological media. select the statement that most accurately describes this disease-causing microbe:

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of