When species share structures that are similar because of their function and not common evolutionary descent These structures are? Homologous features Physical features shared due to evolutionary history (a common ancestor) are said to be homologous. To give one classic example, the forelimbs of whales, humans, birds, and dogs look pretty different on the outside. […]

Which of the following theory states that the universe has no beginning and no end? New quantum theory says universe has ‘no end and no beginning’ Can the Universe Create Itself? “In Stephen Hawking’s new book The Grand Design, he says that because of the law of gravity, the universe can and will create itself […]

Why is uranium used to power nuclear processes? Uranium is the fuel most widely used by nuclear plants for nuclear fission. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart. Although uranium is about 100 times more common than silver, U-235 is […]

What does the term pocketing refer to? During a feeding procedure, what does the term pocketing refer to? Food remaining in the cheeks or under the tongue. What does the term calorie count mean? To keep a record of the patient’s food intake. How should you hold the utensils when feeding a patient? Hold spoon […]

Why can whales grow so big? For something like the blue whale, which could easily be 100 metric tons in body mass, they are practically doubling the size of their body because they’re engulfing a volume of water and Krill that’s larger than their own body. Why have whales evolved to be so much larger […]

What would be the likely function of a plant cell that contains many chloroplasts? Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells. The entire process is called photosynthesis and it all depends on the little green chlorophyll molecules in each chloroplast. Plants are the basis of […]

Were measles common in the 1960s? In the 1960s, measles infected about 3 million to 4 million people in the United States each year. More than 48,000 people were hospitalized, and about 4,000 developed acute encephalitis, a life-threatening condition in which brain tissues become inflamed. What was the mortality rate of measles in 1960? Although […]

How do scientists share their information? Scientists often communicate their research results in three general ways. One is to publish their results in peer-reviewed journals that can be ready by other scientists. Two is to present their results at national and international conferences where other scientists can listen to presentations. Why do scientists share data? […]

Is a nematode a Pseudocoelomate? The pseudocoelomates include the nematodes, rotifers, gastrotrichs, and introverts. Some members of some other phyla are also, strictly speaking, pseudocoelomate. These four phyla of tiny body size (many species no larger than the bigger protozoans) are placed together in part because they… Is a Pseudocoelomate? A pseudocoelomate is an organism […]

What are the 5 ways species can become isolated and form new species? There are five types of isolation that biologically prevent species that might otherwise interbreed to produce hybrid offspring. These are ecological, temporal, behavioral, mechanical/chemical and geographical. What are the 3 types of transmission based precautions? Transmission-Based Precautions. There are three categories of […]