The time span that a species exists can be seen as a "column" extending through the rock layers. Once a species becomes ,
it disappears from the fossil record
and this column ends.

A) extinct
B) endangered
C) fossilized
D) burled

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.

Can yall plz me on this question im having a hard time think about it