Answer the following question given this paragraph: Usually evolutionary changes occur at a very slow pace. Human evolution took millions of years. However, sometimes evolution can also happen quite quickly. Q: Human evolution shows that evolutionary changes typically occur at what pace? Choices: - uneven - sudden - rapid - slow A:
slow
Answer the following question given this paragraph: A familiar liquid is mercury metal. Mercury is an anomaly. It is the only metal we know of that is liquid at room temperature. Mercury also has an ability to stick to itself (surface tension) a property all liquids exhibit. Mercury has a relatively high surface tension, which makes it very unique. Here you see mercury in its common liquid form. Q: What is the only metal that is liquid at room temperature? Choices: - hydrogen - gas - water - mercury A:
mercury
Q: Answer the following question given this paragraph: The related field of biochemistry overlaps to some extent with organic chemistry. Biochemistry is the study of the chemistry of living systems. Many biochemical compounds are considered to be organic chemicals. Both of the molecules shown above are biochemical materials in terms of their use in the body, but organic chemicals in terms of their structure and chemical reactivity. Q: Biochemistry is the study of the chemistry of? Choices: - the Earth - inorganic matter - abiotic factors - living systems A:
A: living systems
Question: Answer the following question given this paragraph: Electrical circuits are often modeled by using water in a river. The potential energy of the water is the highest at the source of the river and decreases as the water flows down the river toward the end. When the water reaches the ocean, its potential energy has become zero. The circuit shown below has a similar situation. The current in this circuit is drawn in the direction of the electron flow. It starts at the battery on the left, where electrons leave the negative terminal and travel around the circuit. Since all of the current travels across each resistor, these resistors are said to be in series . A series circuit is one in which all of the current must pass through every resistor in the circuit. Returning to the water analogy, there is only one riverbed from the top of the mountain to the ocean. Q: Where is the potential energy of a river the highest at? Choices: - the middle - the ocean - the bank - the source A:
Answer: the source
*Question*
Answer the following question given this paragraph: Complement System The complement system is a series of proteins constitutively found in the blood plasma. As such, these proteins are not considered part of the early induced immune response, even though they share features with some of the antibacterial proteins of this class. Made in the liver, they have a variety of functions in the innate immune response, using what is known as the "alternate pathway" of complement activation. Additionally, complement functions in the adaptive immune response as well, in what is called the classical pathway. The complement system consists of several proteins that enzymatically alter and fragment later proteins in a series, which is why it is termed cascade. Once activated, the series of reactions is irreversible, and releases fragments that have the following actions: Bind to the cell membrane of the pathogen that activates it, labeling it for phagocytosis (opsonization) Diffuse away from the pathogen and act as chemotactic agents to attract phagocytic cells to the site of inflammation Form damaging pores in the plasma membrane of the pathogen Figure 21.13 shows the classical pathway, which requires antibodies of the adaptive immune response. The alternate pathway does not require an antibody to become activated. Q: The complement system is a series of proteins constitutively found in the what? Choices: - nucleus - organs - platelets - blood plasma A:
**Answer**
blood plasma
(Q).
Answer the following question given this paragraph: Chemical weathering is different than mechanical weathering. The minerals in the rock change their chemical makeup. They become a different type of mineral or even a different type of rock. Chemical weathering works through chemical reactions that change the rock. Q: What works through chemical reactions that change the rock? Choices: - gradual weathering - chemical breakdown - rock weathering - chemical weathering A:
(A).
chemical weathering