*Question*
Answer the following question given this paragraph: Charge Carried by Electrons and Protons Franklin wrote in his letters and books that he could see the effects of electric charge but did not understand what caused the phenomenon. Today we have the advantage of knowing that normal matter is made of atoms, and that atoms contain positive and negative charges, usually in equal amounts. Figure 18.5 shows a simple model of an atom with negative electrons orbiting its positive nucleus. The nucleus is positive due to the presence of positively charged protons. Nearly all charge in nature is due to electrons and protons, which are two of the. Q: What part of an atom is positive due to the presence of positively charged protons? Choices: - Neutron - Proton - Electron - nucleus A:
**Answer**
nucleus

*Question*
Answer the following question given this paragraph: Birds learn through conditioning to avoid eating monarch butterflies. Q: How do birds learn to avoid eating monarch butterflies? Choices: - instinct - temperature - digestion - conditioning A:
**Answer**
conditioning

*Question*
Answer the following question given this paragraph: At the top of the troposphere is a thin layer of air called the tropopause. You can see it in Figure above . This layer acts as a barrier. It prevents cool air in the troposphere from mixing with warm air in the stratosphere. Q: What thin layer of air acts as a barrier to prevent cool air from mixing with warm air in the stratosphere? Choices: - methosphere - endosphere - liposphere - tropopause A:
**Answer**
tropopause

*Question*
Answer the following question given this paragraph: Q: What term is used to describe the process by which organisms give rise to offspring? Choices: - variation - photosynthesis - osmosis - reproduction A:
**Answer**
reproduction