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

Average annual precipitation and are the two major features that define the biomes on earth.

Are salt and soap nutrients or toxins for yeast? explain.

Drag each tile to the correct box. arrange the phases of mitosis in the correct order. 1 (condensation of chromosomes) 2 (separation of chromosomes) 3 (formation of spindle fibers) 4 (alignment of chromosomes in the center of the cell) 5 (pinching of the cell membrane)