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What are some examples of punctuated equilibrium?

The punctuated equilibrium theory states evolution often happens in abrupt, quick bursts punctuated by long periods of little or no change. This often happens in times of abrupt and catastrophic environmental change or when a small population, isolated from the rest of the species, rapidly develops into a more fit specimen and outcompetes its original population.\nThis theory is partly supported by observed microevolution. For example, the peppered moth was colored primarily white until Britain's Industrial Revolution caused its habitat to blacken with soot. The regular white moths, depri..

What are some different conservatorship forms?

An LPS conservatorship is a court-ordered conservatorship that applies to a person with a serious mental illness. A social service agency must initiate this form of conservatorship against the will of the conservatee, which results in the involuntary confinement of the person to undergo treatment or prevent him from posing a threat to the community.\nA conservatorship can also take the form of a temporary or a long-term conservatorship. A temporary conservatorship generally lasts for a period of 30 to 60 days and is appointed as a short-term solution until a long-term conservatorship can be fo..

What is the name of a young elephant?

Newborn elephant calves are completely reliant on their mothers for the first few months of life. In fact, elephant calves need their mothers well into their second year for both nutrition and protection. It's not just the mother elephants that nurture and coddle the young calves. Elephants are very protective of their young and, when a predator is near, the entire herd gathers together with the young calves in the center of the group.

What common products contain triclosan?

Clinical studies show that triclosan in toothpaste is effective at reducing the risk of gingivitis. The FDA states that there is no evidence of its effectiveness in other applications, and that in some cases its use may be harmful. Its risks come from both direct toxicity and the development of antibiotic-resistant bacteria.\nAnimal studies cited by both the FDA and the Mayo Clinic demonstrate a link between triclosan and disruption of hormones and the immune system. Triclosan is absorbed through the skin; applying the product topically still results in an internal dose of triclosan. Seventy-f..

Which is bigger: the earth or the sun?

The Earth has a diameter of slightly less than 8,000 miles. A line drawn across the Sun would have to be almost exactly 175 times longer than the equivalent line through the Earth. The Sun has sufficient volume to contain over 1 million Earths, and many solar prominences, such as large flares, are themselves far larger than the Earth.

How do you read a measuring tape?

The longest lines on the tape designate whole inches. Each line is marked with a number showing its distance from the end of the tape. For example, if a table is measured lengthwise from left to right, and the end of the table is even with the solid line marked "24," it means the table is 24 inches long.\nThe next longest lines on the measuring tape designate half inches, and are located halfway between the inch marks. Halfway between the half-inch marks are slightly shorter quarter-inch lines. The next shortest lines indicate eighths of an inch, and the shortest lines mark sixteenths of an in..

What are examples of endothermic and ectothermic animals?

All mammals are endothermic, or warm-blooded creatures. Endotherms unconsciously use their metabolism as a way of regulating body temperature.\n\nEctotherms, or cold-blooded animals such as reptiles, most fish and amphibians, must rely on outside sources to warm up or cool down their body temperature. These animals can often be seen hanging out in the shade when it's hot, or sunning themselves on a cool morning.

What is the definition of a "protist"?

How Stuff Works adds "This kingdom, sometimes called Protoctista, consists of single-celled micro-organisms and simple multi-celled organisms." Most of the protist phylums make their home in water, being considered marine or freshwater phylums, although a few are terrestrial or parasitic. A very diverse set of organisms is represented, including amoeba, kelp and various kinds of algae, like Irish moss, which is a kind of red algae.

What organ produces estrogen?

The term estrogen actually describes any one of the group of hormones that have a major influence on the function and development of the female reproductive tract. The three major hormones in the group are estradiol, estrone and estriol. Estradiol is the chief hormone in the group. Estrogen levels in the bloodstream tend to be at their highest during ovulation and menstruation.

What causes a volcano to erupt?

Molten rock, called magma, forms underground when Earth's tectonic plates collide or move apart, or when activity within the mantle, a very hot layer beneath the earth's crust, causes the crust to melt. Magma contains dissolved gases that remain dissolved as long as the pressure of the gas is not greater than the confining pressure of the solid rock around it. If the vapor pressure becomes great enough, the gas forms small bubbles within the magma. These bubbles are less dense than the surrounding magma, so they push upward to escape it, and an eruption occurs. The composition of the..

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