*Question*
Answer the following question given this paragraph: Mollusks have ventral nerve cords. The tissue beneath the shell is called the mantle. The mantle cavity contains hemolymph. Figure 15.33 Which of the following statements about common features of chordates is true? a. The dorsal hollow nerve cord is part of the chordate central nervous system. In vertebrate fishes, the pharyngeal slits become the gills. Humans are not chordates because humans do not have a tail. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column. Q: What is the tissue beneath a mollusks' shell called? Choices: - cartilage - skin - mucous - mantle A:
**Answer**
mantle

*Question*
Answer the following question given this paragraph: Enthalpy changes also occur when a solute undergoes the physical process of dissolving into a solvent. Hot packs and cold packs (see Figure below ) use this property. Many hot packs use calcium chloride, which releases heat when it dissolves according to the equation below. Q: When a solute dissolves into a solvent what is that called? Choices: - solubility - viscosity - mixing - enthalpy A:
**Answer**
enthalpy

*Question*
Answer the following question given this paragraph: Earth gets its energy from the Sun. The Sun gives off photons of energy that travel in waves. All the wavelengths of the Sun's energy make up the electromagnetic (EM) spectrum. Q: Where does the earth gets its energy from? Choices: - decomposers - precipitation - heat - sun A:
**Answer**
sun

*Question*
Answer the following question given this paragraph: Covalent Molecules and Compounds Just as an atom is the simplest unit that has the fundamental chemical properties of an element, a molecule is the simplest unit that has the fundamental chemical properties of a covalent compound. Some pure elements exist as covalent molecules. Hydrogen, nitrogen, oxygen, and the halogens occur naturally. Q: What is the simplest unit that has the fundamental chemical properties of an element? Choices: - neutron - nucleus - cell - atom A:
**Answer**
atom