Evolution is defined as the change in frequency of certain traits across generations. The accumulation of new traits may lead to new characteristics or even new species over time. This means that, with time, enough changes can lead to the formation of a new species. Evolution is a continuous, extremely gradual process that has created…
Tag: biology
The Biology of Reproduction
Every organism must reproduce (create offspring) in order to pass a part of themselves on into future generations. Depending on the organism, it can either reproduce using sexual or asexual reproduction, which both involve cell division. The parental traits of sexually reproducing organisms will also mix to form a unique combination in the offspring, and…
The Neurobiology of Romantic Love
Romantic love is one of the most universal human experiences. More than 20 years ago, biological anthropologist Helen Fisher studied 166 societies and found evidence of romantic love in 147 of them.1 According to Richard Schwartz, associate professor of psychiatry at MacLean Hospital, romantic love must be wired into our basic biological nature due to…
Sex and Methamphetamine
Methamphetamine (N-methyl-1-phenyl-propan-2-amine), also known as meth, crystal, chalk, and ice, is a psychoactive substance that stimulates the central nervous system when ingested. It belongs to a drug class called “psychomotor stimulants,” as it produces increased energy and attention.1 It is infrequently prescribed by clinicians to treat the symptoms of attention deficit hyperactivity disorder (ADHD), but…