Students began a study of 30 guppies small fish during a school year. At the beginning of the year, half the guppies were blue and half were yellow. As the year went by, the guppies reproduced. By the end of the year, there were 50 guppies and 90% were blue. What are the four descriptions that explain how natural selection affected the blue guppies in this study?

What came first the elephent or the crocodile

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red.b) the pollen grains will be pure blue.c) the pollen grains will have red interiors and blue exteriors.d) the pollen grains will have blue interiors and red exteriors.

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)