Q: Caves form over time when what causes rocks like limestone to dissolve? Read this paragraph and choose the correct option from the provided answers: It can be really exciting to explore a big underground cave like the one in this picture. Do you know how caves form? Believe it or not, water is the answer. Water slowly dissolves rocks, especially certain types of rocks such as limestone. How does something as mild and harmless as water cause hard rocks to dissolve? In this chapter, you'll find out. Choices: - weather - acid - air - water A:
water

Q: Unlike fibrous or cartilaginous joints, the articulating bone surfaces at what joint type are not directly connected to each other with fibrous connective tissue or cartilage? Read this paragraph and choose the correct option from the provided answers: which the articulating surfaces of the bones contact each other. Also unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly against each other, allowing for increased joint mobility. Choices: - proximal joint - knee joint - polymeric joint - synovial joint A:
synovial joint

Q: Q: Why will water balloons launched into the air eventually burst? Read this paragraph and choose the correct option from the provided answers: Each day, hundreds of weather balloons are launched. Made of a synthetic rubber and carrying a box of instruments, the helium-filled balloon rises up into the sky. As it gains altitude, the atmospheric pressure becomes less and the balloon expands. At some point the balloon bursts due to the expansion, the instruments drop (aided by a parachute) to be retrieved and studied for information about the weather. Choices: - heat - momentum - friction - expansion A:
A: expansion

Question: Q: Programmed cell death, which goes by what term, is important for removing damaged or unnecessary cells? Read this paragraph and choose the correct option from the provided answers: 9.3 Response to the Signal The initiation of a signaling pathway is a response to external stimuli. This response can take many different forms, including protein synthesis, a change in the cell's metabolism, cell growth, or even cell death. Many pathways influence the cell by initiating gene expression, and the methods utilized are quite numerous. Some pathways activate enzymes that interact with DNA transcription factors. Others modify proteins and induce them to change their location in the cell. Depending on the status of the organism, cells can respond by storing energy as glycogen or fat, or making it available in the form of glucose. A signal transduction pathway allows muscle cells to respond to immediate requirements for energy in the form of glucose. Cell growth is almost always stimulated by external signals called growth factors. Uncontrolled cell growth leads to cancer, and mutations in the genes encoding protein components of signaling pathways are often found in tumor cells. Programmed cell death, or apoptosis, is important for removing damaged or unnecessary cells. The use of cellular signaling to organize the dismantling of a cell ensures that harmful molecules from the cytoplasm are not released into the spaces between cells, as they are in uncontrolled death, necrosis. Apoptosis also ensures the efficient recycling of the components of the dead cell. Termination of the cellular signaling cascade is very important so that the response to a signal is appropriate in both timing and intensity. Degradation of signaling molecules and dephosphorylation of phosphorylated intermediates of the pathway by phosphatases are two ways to terminate signals within the cell. Choices: - mytosis - synthesis - mutations - apoptosis A:
Answer: apoptosis

*Question*
Q: Hydrogen peroxide will decompose over time to produce _______ gas. Read this paragraph and choose the correct option from the provided answers: Again, substances in all states of matter commonly participate in decomposition reactions. For example, hydrogen peroxide will decompose over time to produce water and oxygen gas according to the following equation:. Choices: - methane - hydrogen and helium - water and carbon dioxide - water and oxygen A:
**Answer**
water and oxygen

Q: Q: The amniotic sac is attached to what? Read this paragraph and choose the correct option from the provided answers: Attached to the placenta is the amniotic sac , an enclosed membrane that surrounds and protects the fetus (see Figure above ). It contains amniotic fluid, which consists of water and dissolved substances. The fluid allows the fetus to move freely until it grows to fill most of the available space. The fluid also cushions the fetus and helps protect it from injury. Choices: - Umbilical Cord - Stomach - uterus - placenta A:
A: placenta