Who proposed punctuated equilibrium? Stephen Jay Gould What is punctuated equilibrium quizlet? Punctuated equilibrium. A theory that states species stay the same for a long time, then new species evolve suddenly due to global changes and mass extinction. Coordinated stasis. A pattern where most species appear at about the same time. Mass extinction. What is […]
Is oil really fossil fuel?
Is oil really fossil fuel? Fossil fuels include coal, petroleum (oil), natural gas, oil shales, bitumens, and tar sands and heavy oils. For modern life, these energy sources rival food and water in importance. Why can’t we get rid of fossil fuels? We understand today that humanity’s use of fossil fuels is severely damaging our […]
What is causality theory?
What is causality theory? Causality is a genetic connection of phenomena through which one thing (the cause) under certain conditions gives rise to, causes something else (the effect). The essence of causality is the generation and determination of one phenomenon by another. A cause is an active and primary thing in relation to the effect. […]
Why are diodes important?
Why are diodes important? Conducting an electric current in one direction Despite being nothing more than a simple two-pin semiconductor devices, diodes are vital to modern electronics. Some of their most common applications include turning AC to DC, isolating signals from a supply, and mixing signals. What are the applications of diodes? The application areas […]
What does molar heat capacity depend on?
What does molar heat capacity depend on? Like the heat capacity of an object, the molar heat capacity of a substance may vary, sometimes substantially, depending on the starting temperature T of the sample and the pressure P applied to it. What is the unit of molar heat capacity? The molar heat capacity is the […]
Who used a compound microscope to see Chambers?
Who used a compound microscope to see Chambers? Robert Hooke What details can Electron microscopes reveal? As the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, electron microscopes have a higher resolving power than light microscopes and can reveal the structure of smaller objects. What type […]
Why do metals gain electrons?
Why do metals gain electrons? Metals: Metals like to lose valence electrons to form cations to have a fully stable octet. They absorb energy (endothermic) to lose electrons. The electron affinity of metals is lower than that of nonmetals. Nonmetals: Nonmetals like to gain electrons to form anions to have a fully stable octet. Are […]
Is a cell phone an electronic device?
Is a cell phone an electronic device? A mobile device is an electronic device which its user can easily carry with them. Typical examples are a mobile phone, PDA and handheld game consoles. Mobile devices do not need an external power supply to work. Usually, they have a battery to hold electricity to work without […]
Are hydrogen balloons safe?
Are hydrogen balloons safe? “Since hydrogen is an unstable, inflammable gas, there is a great danger associated with hydrogen balloons. They easily explode and catch fire. “Flying balloons are filled with gas lighter than the atmospheric air, usually helium and hydrogen. Can hydrogen be used for balloons? Hydrogen is another gas lighter than air; it’s […]
Which is better leaf or coil springs?
Which is better leaf or coil springs? Leaf springs are better for heavier vehicles and those who may need to haul more weight. They’re also simpler but less adjustable than coil springs. Coil spring suspension systems are better for performance driving as you can fine-tune your suspension. They offer greater comfort and flexibility for improved […]