Answer: alternative A.
Explanation: Fixism was a current theory during biology history, and it stated that species were always like they are at the present time, not being able to change during time. Darwin's evolutionary theory, developed at the 19th century, said the opposite: species were able to change and they still do it. One way to prove it was <u>studying fossils and its morfologycal characteristics in order to link them to more recent species</u>, and <u>establish a taxonomical connection between them</u>. The study of fossils is know as paleontology, and it this way it changed the naturalist's views.
Answer:
I think it is B
Explanation:
They aren't very clear about how acupuncture will stop pain channels
Muskrats eat oak trees and if the oak tree had a disease and all of them died. then the muskrat would have to relie on someething else to eat because muskrats eat oak trees.
An ectotherm gets its heat from external sources
(Remember "ecto" means outer, "endo" means inner)
