By Rene Fester Kratz PhD, Donna Rae Siegfried
An up to date variation of the last word consultant to figuring out biology
Ever puzzled how the meals you consume turns into the strength your physique must maintain going? the speculation of evolution says that people and chimps descended from a standard ancestor, yet does it let us know how and why? We people are insatiably curious creatures who can not help pondering how issues work — beginning with our personal our bodies. would it be nice to have a unmarried resource of quickly solutions to all our questions about how residing issues paintings? Now there's.
From molecules to animals, cells to ecosystems, Biology For Dummies, 2d version solutions all of your questions about how dwelling issues paintings.
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no matter if you are presently enrolled in a biology classification or simply need to know extra approximately this attention-grabbing and ever-evolving box of research, this enticing advisor provide you with a grip on complicated biology techniques and unencumber the mysteries of ways existence works very quickly.
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Extra info for Biology For Dummies
Because the protons are positive and the neutrons have no charge, the net charge of an atom’s nucleus is positive. ✓ Clouds of electrons surround the nucleus. Electrons carry a negative charge but have no mass. Atoms become ions when they gain or lose electrons. In other words, ions are essentially charged atoms. Positive (+) ions have more protons than electrons; negative (–) ions have more electrons than protons. Positive and negative charges attract one another, allowing atoms to form bonds, as explained in the later “Molecules, Compounds, and Bonds” section.
Then” statement. 3. Decide on your experimental treatment, what you’ll measure, and how often you’ll make measurements. The condition you alter in your experiment is your experimental variable. The changes you measure are your responding variables. 4. Create two groups for your experiment: an experimental group and a control group. The experimental group receives the experimental treatment; in other words, you vary one condition that might affect this group. The control group should be as similar as possible to your experimental group, but it shouldn’t receive the experimental treatment.
Any factor that can be changed in an experiment is called a variable. Three kinds of variables are especially important to consider when designing experiments: ✓ Experimental variables: The factor you want to test is an experimental variable (also called an independent variable). ✓ Responding variables: The factor you measure is the responding variable (also called a dependent variable). ✓ Controlled variables: Any factors that you want to remain the same between the treatments in your experiment are controlled variables.