To determine the velocity of a stream in several places, two earth science students tossed a stick in and timed its travel downstream. The first student, Jenny Jabberjaws, discovered that the stick moved from the starting point to a distance of 20 meters downstream in just 20 seconds. How fast was the stream moving at her location?

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above