Answer the following question given this paragraph: In this lesson, you learned about chemical bonds in a water molecule. The bonds form between atoms of hydrogen and oxygen when they share electrons. This type of bond is an example of a covalent bond. Q: How do you calculate the atomic mass of an element? Choices: - add neutrons and electrons - count the electrons - multiply protons by neutrons - add the protons and neutrons together A:
add the protons and neutrons together
------
Answer the following question given this paragraph: The girl pictured above became negatively charged because electrons flowed from the van de Graaff generator to her. Whenever electrons are transferred between objects, neutral matter becomes charged. This occurs even with individual atoms. Atoms are neutral in electric charge because they have the same number of negative electrons as positive protons. However, if atoms lose or gain electrons, they become charged particles called ions. You can see how this happens in the Figure below . When an atom loses electrons, it becomes a positively charged ion, or cation. When an atom gains electrons, it becomes a negative charged ion, or anion. Q: Gain or loss of what causes an atom to become a negatively or positively charged ion? Choices: - protons - neutrons - nucleus - electrons A:
electrons
------
Answer the following question given this paragraph: Terrestrial biomes are classified by the climate and their biodiversity , especially the types of primary producers . The world map in Figure below shows where 13 major terrestrial biomes are found. Q: Terrestrial biomes are classified by the climate and their what? Choices: - habitat - pollution - geography - biodiversity A:
biodiversity
------
Answer the following question given this paragraph: Unlike that of the Hexapoda, the head and thorax of most crustaceans is fused to form a cephalothorax (Figure 28.40), which is covered by a plate called the carapace, thus producing a body structure of two tagma. Crustaceans have a chitinous exoskeleton that is shed by molting whenever the animal increases in size. The exoskeletons of many species are also infused with calcium carbonate, which makes them even stronger than in other arthropods. Crustaceans have an open circulatory system where blood is pumped into the hemocoel by the dorsally located heart. Hemocyanin and hemoglobin are the respiratory pigments present in these animals. Q: In most crustaceans, what two structures fuse to form a cephalothorax? Choices: - foot and toes - body and shoulders - wing and legs - head and thorax A:
head and thorax
------