Tutor and Freelance Writer. Science Teacher and Lover of Essays. Article last reviewed: 2019 | St. Rosemary Institution © 2010-2020 | Creative Commons 4.0

Types of Contraceptive Methods: Pros & Cons

CONTRACEPTIVES: The use of a device or procedure to prevent conception (pregnancy) as a result of sexual activity Sexual Abstinence Voluntary restraint from sexual intercourse   Advantages NO risk of pregnancy NO risk of STIs Appeals to certain religions/beliefs Disadvantages May not experience pleasure Calendar/Rhythm Method No sexual intercourse during ovulation   Advantages NO side…

Central & Peripheral Parts of a Computer

Central Parts Motherboard The main circuit board of the computer to which all components are attached. It contains metal tracks through which electricity flows, electronic devices, and transistors that control the flow of electricity. (The motherboard is like a city, with highways and streets that connect the buildings together.) CPU (Central Processing Unit) Also called…

Stress, Stressors, Pain

Nature of stress Stressor: stimuli/ events in environment that place demands on us Response: stress (physiological? Cognitive? Behavioural? Person-situation Interaction: Transaction between organism & environment Stressors (Situations) Eliciting Stimuli: Place demands on well-being & require us to adapt Microstressors: daily hassles Catastrophic Events: occur unexpectedly..affect large #’s of people Major Negative Events: stressful life events…

Endosymbiosis & Lateral Gene Transfer

Endosymbiotic Theory: Mitochondria & Chloroplast are descendants of prokaryotic cells; they share clear structural/ biochemical features with modern prokaryotes. Cyanobacteria: blue-green algae; obtain their energy through photosynthesis Lateral gene Transfer: Gene from Mitochondria & Chloroplast MOVE from Mitochondria & Chloroplast to the nucleus Evidence of Endosymbiosis (Happened after evolution of aerobic prokaryotes) Morphology: Form of…