Answer the following question given this paragraph: Near-Earth asteroids have orbits that cross Earth's orbit. This means that they can collide with Earth. There are over 4,500 known near-Earth asteroids. Small asteroids do sometimes collide with Earth. An asteroid about 510 m in diameter hits about once per year. Five hundred to a thousand of the known near-Earth asteroids are much bigger. They are over 1 kilometer in diameter. When large asteroids hit Earth in the past, many organisms died. At times, many species became extinct. Astronomers keep looking for near-Earth asteroids. They hope to predict a possible collision early so they can to try to stop it. Q: In the past, what colliding with planet earth has caused many organisms to die off? Choices: - acid rain - meteorites - the Sun - asteroids A:
asteroids
(Question)
Answer the following question given this paragraph: Heat capacity is the amount of internal energy that the substance can store. A large heat capacitance means the substance can store a lot of internal energy and thus the temperature changes slowly. Aluminum foil has a small heat capacitance and water has a large one. Q: What is the term for the amount of internal energy that the substance can store? Choices: - mass capacity - temperature capacity - humidity capacity - heat capacity A:
(Answer)
heat capacity
Ques: Answer the following question given this paragraph: Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the oxygen atoms in the Figure above . Alone, each oxygen atom has six valence electrons. By sharing two pairs of valence electrons, each oxygen atom has a total of eight valence electrons. This fills its outer energy level, giving it the most stable arrangement of electrons. The shared electrons are attracted to both oxygen nuclei, and this force of attraction holds the two atoms together in the oxygen molecule. Q: What do covalent bonds give atoms a more stable arrangement of? Choices: - protons - neutrons - cell walls - electrons A:
Ans: electrons
(Q).
Answer the following question given this paragraph: Evolution that occurs over a short period of time is known as microevolution . It might take place in just a couple of generations. This scale of evolution occurs at the level of the population. The Grants observed evolution at this scale in populations of Darwin's finches. Beak size in finch populations changed in just two years because of a serious drought. Q: Evolution that occurs over a short period of time is known as what? Choices: - short term evolution - pseudoevolution - relatedness - microevolution A:
(A).
microevolution
Ques:Answer the following question given this paragraph: Cellulose is composed of very long strands of glucose monomers that are hydrogen bonded to one another. Cellulose is largely indigestible and comprises the cell walls of plants. Q: What is composed of very long strands of glucose monomers, is largely indigestible and comprises the cell walls of plants? Choices: - vascular cambrium - chlorophyll - tree bark - cellulose A:

Ans:cellulose
Ques:Answer the following question given this paragraph: Energy can be transferred between molecules during collisions. Collisions are completely elastic. Q: Because collisions are ______, energy can be transferred between molecules during them. Choices: - conductive - inelastic - preservative - elastic A:

Ans:
elastic