Classify as man-made or natural extinction: Changes in oxygen levels in ocean water a. natural extinction
b. both
c. neither
d. man-made

Which statement best describes a typical difference that could be found between the “analysis” and “conclusion” sections of a lab report?

Plant species a has a diploid number of 12. plant species b has a diploid number of 16. a new species, c, arises as an allopolyploid from a and b. the diploid number for species c would probably be a) 12. b) 14. c) 16. d) 28. e) 56.

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?