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:
mantle
(Question)
Answer the following question given this paragraph: The electrons in the outer energy level of an atom are called valence electrons . It is valence electrons that are potentially involved in chemical reactions. The number of valence electrons determines an element's reactivity, or how likely the element is to react with other elements. The number of valence electrons also determines whether the element can conduct electric current. That's because electric current is the flow of electrons. Table below shows how these properties vary in elements from each class. Q: What are electrons in the outer energy level of an atom called? Choices: - shell electrons - outer electrons - positive electrons - valence electrons A:
(Answer)
valence electrons
Ques: Answer the following question given this paragraph: Energy from the Sun has a wide range of wavelengths. The total range of energy is called the electromagnetic spectrum ( Figure below ). Q: What is the total range of the energy from the sun called? Choices: - molecular spectrum - solar spectrum - measured spectrum - electromagnetic spectrum A:
Ans: electromagnetic spectrum
(Q).
Answer the following question given this paragraph: In an equilibrium population, allele and genotype frequencies do not change over time. Q: In what type of population do allele and genotype frequencies not change over time? Choices: - saturation population - inequilibrium population - shape population - equilibrium population A:
(A).
equilibrium population
Ques:Answer the following question given this paragraph: Some of Earth's freshwater is found in wetlands. A wetland is an area that is covered with water, or at least has very soggy soil, during all or part of the year. Certain species of plants thrive in wetlands, and they are rich ecosystems. Freshwater wetlands are usually found at the edges of steams, rivers, ponds, or lakes. Wetlands can also be found at the edges of seas. Q: What is the name for an area that is covered in water, or at least has soggy soil, during all or part of the year? Choices: - coastal zone - a stream - a crater - a wetland A:

Ans:a wetland
Answer the following question given this paragraph: Based on their molar masses, hydrogen is the lightest molecule, and oxygen is the heaviest. Because all three volumes are the same, each balloon contains the same number of gas molecules. Therefore, the hydrogen balloon will have the lowest mass, and the oxygen balloon will have the highest. Q: What is the lightest molecule? Choices: - oxygen - helium - silicon - hydrogen A:
hydrogen