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The last step of the scientific method is

According to Aristotle, all living things could be divided into two groups:

In a testcross, F1 hybrids are crossed to an individual known to be ________ for the trait.

Who determines scientific facts?

Animals that have the four basic characteristics of chordates plus a vertebral column are

Which describes BEST how equipment is used in science?

In the F2 generation of a cross between a red-flowered snapdragon (homozygous) and a white-flowered snapdragon, the expected phenotypic ratio of the offspring is ________.

A somatic cell with two of each type of chromosome characteristic of the species has a (n) _____ chromosome number.

In an experiment, the researcher is trying to examine the effects of artificial sweeteners on the germination of radish seeds.  She gives the plants in Group A sugar.  Plants in Group B receive NutraSweet.  Plants in Group C get Sweet & Low.  She finds that those in Group A have the longest roots after two weeks.  There is also a group D.  What is the dependent variable?

Species fit along a continuum of r- and K-selection; not all species show purely r traits or purely K traits. For example, sparrows produce several young per year but only live a few years, while the wandering albatross first reproduces at age 10 and then produces a single egg every other year during its 40-year life span. Compared to the albatross, the sparrow is more