How do streams and rivers affect erosion? As a stream flows faster, it can carry larger and larger particles. At flood stage, rivers flow much faster and do more erosion because the added water increases the stream’s velocity. Sand, silt and clay size particles generally make up the suspended load for a stream (Figure 10.2). […]

What makes a compound organic or inorganic? The main difference is in the presence of a carbon atom; organic compounds will contain a carbon atom (and often a hydrogen atom, to form hydrocarbons), while almost all inorganic compounds do not contain either of those two atoms. Meanwhile, inorganic compounds include the salts, metals, and other […]

How many species go extinct in an average year? These experts calculate that between 0.01 and 0.1% of all species will become extinct each year. If the low estimate of the number of species out there is true – i.e. that there are around 2 million different species on our planet** – then that means […]

What does Claudius say in his soliloquy? What does Claudius reveal in his soliloquy? What is the “primal eldest curse” he is speaking of? Claudius reveals his sin is similar to the “primal eldest curse,” or the curse put upon Cain for murdering his brother Abel, which is accurate being that Claudius killed his brother, […]

How does the secondary response differ from the primary response? Primary Immune Response is the reaction of the immune system when it contacts an antigen for the first time. Secondary Immune Response is the reaction of the immune system when it contacts an antigen for the second and subsequent times. Why are primary and secondary […]

Are all whiptail lizards female? Many species of whiptail lizards are all female. That’s right: these badass ladies figured out how clone themselves, so they wouldn’t have to bother having sex with males to maintain their species. This natural form of cloning is called “parthenogenesis” — and it isn’t as complicated as it sounds. Are […]

Why are boa constrictors dangerous? Boa constrictors strike when they perceive a threat. Their bite can be painful, especially from large snakes, but is rarely dangerous to humans. Specimens from Central America are more irascible, hissing loudly and striking repeatedly when disturbed, while those from South America tame down more readily. Are boa constrictors invasive […]

Which filter collect dust with high efficiency? Most modern cell-processing facilities have ventilation systems with filtered air—using high-efficiency particulate air (HEPA) filters, a technology developed in the 1940s. HEPA filters have a minimum particle collective efficiency of 99.97% for particles of 0.3 µm diameter or more. What does a PM2 5 filter remove? This “melt-blown” […]

What is the cerebrum responsible for in the brain? The cerebrum (front of brain) is composed of the right and left hemispheres, which are joined by the corpus callosum. Functions of the cerebrum include: initiation of movement, coordination of movement, temperature, touch, vision, hearing, judgment, reasoning, problem solving, emotions, and learning. What happens if you […]

What type of chemical bond holds the atoms together in ionic compounds? Electrostatic attraction is the attraction between atoms that have opposite charge and holds the atoms together in ionic bonds. Think of it as an atomic glue. In this type of bond, one atom gives up electrons and becomes a positively charged ion (cation). […]