Q: Q: Female monotremes share what external opening with reptiles and birds? Read this paragraph and choose the correct option from the provided answers: Female monotremes lack a uterus and vagina. Instead, they have a cloaca with one external opening, like the cloaca of reptiles and birds. The opening is used to excrete wastes as well as lay eggs. The eggs of monotremes have a leathery shell, like the eggs of reptiles. Female monotremes have mammary glands but not nipples. They secrete milk to feed their young from a patch on their belly. This form of reproduction is least risky for the mother but most risky for the offspring. Choices: - urethra - vagina - anus - cloaca A:
A: cloaca

Q: Q: Potential energy is present in objects that are what? Read this paragraph and choose the correct option from the provided answers: Potential energy is present in objects that are ______________. Choices: - crystals - rigid - unstable - elastic A:
A: elastic

Q: Q: Food chains and what describe the transfer of energy within an ecosystem, from one organism to another? Read this paragraph and choose the correct option from the provided answers: Describing the flow of energy within an ecosystem essentially answers this question. To survive, one must eat. Why? To get energy. Food chains and webs describe the transfer of energy within an ecosystem, from one organism to another. In other words, they show who eats whom. Choices: - spider webs - fuel webs - the webs - food webs A:
A: food webs

Q: Q: What crystals consist of molecules at the lattice points of the crystal, held together by relatively weak intermolecular forces? Read this paragraph and choose the correct option from the provided answers: 4. Molecular crystals -- Molecular crystals typically consist of molecules at the lattice points of the crystal, held together by relatively weak intermolecular forces (see Figure below ). The intermolecular forces may be dispersion forces in the case of nonpolar crystals, or dipole-dipole forces in the case of polar crystals. Some molecular crystals, such as ice, have molecules held together by hydrogen bonds. When one of the noble gases is cooled and solidified, the lattice points are individual atoms rather than molecules. In all cases, the intermolecular forces holding the particles together are far weaker than either ionic or covalent bonds. As a result, the melting and boiling points of molecular crystals are much lower. Lacking ions or free electrons, molecular crystals are poor electrical conductors. Choices: - quartz crystals - salt crystals - healing crystals - molecular crystals A:
A: molecular crystals