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…

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…

Descent with Modification: A Darwinian View of Life

Darwin’s Five Observations More young are produced than survive Individuals vary in their characteristics Some characteristics are better than others These characteristics are inheritable Long periods of time are available Darwin’s Two Major Points Many species of organisms presently inhabiting the earth are descendants from ancestral species that were different from modern species The mechanism…

What is Dehydration? Causes, Treatment

Dehydration is a serious and potentially life-threatening condition that is caused by the lack of water needed for the body to function well. If not treated, dehydration can cause high body temperature, sleepiness, visual snow, dizziness, unconsciousness, hypotension (decreased blood pressure), headaches, nausea, paresthesia (limbs tingling), shriveled and wrinkled skin, dim vision, incapability to urinate,…

Community Ecology: Predation, Mimicry, Competition

Community: A group of species that occupy a given area, interacting either directly or indirectly Predation Consumption of one organism by another organism Predator-prey population oscillations Predators and prey are agents of natural selection for each other defense or attack strategies camouflage aposematic colouration Mimicry Batesian: One species is harmful the other is non-harmful Non-harmful…