Answer the following question given this paragraph: Figure below shows a diagram of Mercury's interior. Mercury is one of the densest planets. Scientists think that the interior contains a large core made mostly of melted iron. Mercury's core takes up about 42% of the planet's volume. Mercury's highly cratered surface is evidence that Mercury is not geologically active. Q: What do scientist's believe mercury's core is mostly made of? Choices: - water - quicksilver - helium gas - melted iron A:
melted iron
Answer the following question given this paragraph: Many animals, especially mammals, use metabolic waste heat as a heat source. When muscles are contracted, most of the energy from the ATP used in muscle actions is wasted energy that translates into heat. Severe cold elicits a shivering reflex that generates heat for the body. Many species also have a type of adipose tissue called brown fat that specializes in generating heat. Q: Shivering and adipose tissue called brown fat are used by mammals in particular to produce what? Choices: - energy - blood - nutrition - heat A:
heat
Q: Answer the following question given this paragraph: Living in water does present challenges to plants, however. For one thing, pollination by wind or animals isn't feasible under water, so aquatic plants may have adaptations that help them keep their flowers above water. For instance, water lilies have bowl-shaped flowers and broad, flat leaves that float. This allows the lilies to collect the maximum amount of sunlight, which does not penetrate very deeply below the water's surface. Plants that live in moving water, such as streams and rivers, may have different adaptations. For example, cattails have narrow, strap-like leaves that reduce their resistance to the moving water (see Figure below ). Q: What kind of water are cattails adapted for with narrow, strap-like leaves? Choices: - stagnant water - saline water - turbulent water - moving water A:
A: moving water
Question: Answer the following question given this paragraph: Figure 39.19 The protein inside (a) red blood cells that carries oxygen to cells and carbon dioxide to the lungs is (b) hemoglobin. Hemoglobin is made up of four symmetrical subunits and four heme groups. Iron associated with the heme binds oxygen. It is the iron in hemoglobin that gives blood its red color. Q: What does hemoglobin in blood carry to the cells? Choices: - methane - carbon dioxide - nitrogen - oxygen A:
Answer: oxygen
*Question*
Answer the following question given this paragraph: Birds are four-limbed, endothermic vertebrates with wings and feathers. They produce amniotic eggs and are the most numerous class of vertebrates. Q: How many limbs to birds have? Choices: - five - six - ten - four A:
**Answer**
four
Q: Answer the following question given this paragraph: Balanced chemical reactions are balanced in terms of moles. Q: Balanced chemical reactions are balanced in what? Choices: - atoms - molecular bonds - electrical charge - terms of moles A:
A: terms of moles