Q: In chemical reactions, what substances can act like metals or nonmetals, depending on their number of electrons? Read this paragraph and choose the correct option from the provided answers: How metalloids behave in chemical interactions with other elements depends mainly on the number of electrons in the outer energy level of their atoms. Metalloids may act either like metals or nonmetals in chemical reactions. Choices: - diacritics - minerals - synthetics - metalloids A:
metalloids

Q: The majority of salamanders lack what organs, so respiration occurs through the skin or through external gills? Read this paragraph and choose the correct option from the provided answers: Modern Amphibians Amphibia comprises an estimated 6,770 extant species that inhabit tropical and temperate regions around the world. Amphibians can be divided into three clades: Urodela ("tailed-ones"), the salamanders; Anura ("tail-less ones"), the frogs; and Apoda ("legless ones"), the caecilians. Urodela: Salamanders Salamanders are amphibians that belong to the order Urodela. Living salamanders (Figure 29.16) include approximately 620 species, some of which are aquatic, other terrestrial, and some that live on land only as adults. Adult salamanders usually have a generalized tetrapod body plan with four limbs and a tail. They move by bending their bodies from side to side, called lateral undulation, in a fish-like manner while "walking" their arms and legs fore and aft. It is thought that their gait is similar to that used by early tetrapods. Respiration differs among different species. The majority of salamanders are lungless, and respiration occurs through the skin or through external gills. Some terrestrial salamanders have primitive lungs; a few species have both gills and lungs. Unlike frogs, virtually all salamanders rely on internal fertilization of the eggs. The only male amphibians that possess copulatory structures are the caecilians, so fertilization among salamanders typically involves an elaborate and often prolonged courtship. Such a courtship allows the successful transfer of sperm from male to female via a spermatophore. Development in many of the most highly evolved salamanders, which are fully terrestrial, occurs during a prolonged egg stage, with the eggs guarded by the mother. During this time, the gilled larval stage is found only within the egg capsule, with the gills being resorbed, and metamorphosis being completed, before hatching. Hatchlings thus resemble tiny adults. Choices: - throats - mouths - noses - lungs A:
lungs

Q: Q: Orbiting at a fairly typical 370 kilometers, the international space station is an example of what? Read this paragraph and choose the correct option from the provided answers: We commonly talk about satellites orbiting Earth. But what does that really mean? When a satellite, space shuttle, or some other object is orbiting a planet, it maintains a circular orbit around the planet a constant distance off the surface. Manmade satellites typically orbit between 200 and 400 miles. For example, the International Space Station (ISS) orbits at 370 km, or 230 miles. Choices: - alteration satellite - flagella satellite - high orbit satellite - manmade satellite A:
A: manmade satellite

Question: Q: The afferent arterioles service about 1.3 million of what in each kidney? Read this paragraph and choose the correct option from the provided answers: Nephrons and Vessels The renal artery first divides into segmental arteries, followed by further branching to form interlobar arteries that pass through the renal columns to reach the cortex (Figure 25.9). The interlobar arteries, in turn, branch into arcuate arteries, cortical radiate arteries, and then into afferent arterioles. The afferent arterioles service about 1.3 million nephrons in each kidney. Choices: - dendrites - axons - neurons - nephrons A:
Answer: nephrons

*Question*
Q: Elemental carbon is a black, dull-looking solid that conducts heat and this? Read this paragraph and choose the correct option from the provided answers: Elemental carbon is a black, dull-looking solid that conducts heat and electricity well. It is very brittle and cannot be made into thin sheets or long wires. Of these properties, how does carbon behave as a metal? How does carbon behave as a nonmetal?. Choices: - light - energy - vibration - electricity A:
**Answer**
electricity

Q: When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as which type of gas is produced? Read this paragraph and choose the correct option from the provided answers: When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced ( Figure below ). The production of a gas is also an indication that a chemical reaction may be occurring. Choices: - chlorine - oxygen - nitrogen - hydrogren A:
hydrogren