Answer the following question given this paragraph: In science, we need to make observations on various phenomena to form and test hypotheses. Some phenomena can be found and studied in nature, but scientists often need to create an experiment . Experiments are tests under controlled conditions designed to demonstrate something scientists already know or to test something scientists wish to know. Experiments vary greatly in their goal and scale, but always rely on repeatable procedure and logical analysis of the results. The process of designing and performing experiments is a part of the scientific method. Q: In science, we need to make observations on various phenomena to form and test what? Choices: - assumptions - theories - variations - hypotheses A:
hypotheses
Answer the following question given this paragraph: Water treatment is a series of processes that remove unwanted substances from water. The goal of water treatment is to make the water safe to return to the natural environment or to the human water supply. Treating water for other purposes may not include all the same steps. That's because water used in agriculture or industry may not have to be as clean as drinking water. Q: What is a series of processes that remove unwanted substances from water called? Choices: - water filtration - water dilution - water cleaning - water treatment A:
water treatment
Q: Answer the following question given this paragraph: Almost all surfaces reflect some of the light that strikes them. The still water of the lake in Figure above reflects almost all of the light that strikes it. The reflected light forms an image of nearby objects. An image is a copy of an object that is formed by reflected or refracted light. Q: A visual "copy" of an object that is formed by reflected or refracted light is called what? Choices: - mirror - instance - photo - image A:
A: image
Question: Answer the following question given this paragraph: Living cells need organic molecules, known as nucleic acids . Nucleic acids are molecules that store genetic information. They pass that genetic information to the next generation. Deoxyribonucleic acid (DNA) is the nucleic acid that carries information for nearly all living cells today. DNA has done this for most of Earth's history. Ribonucleic acid (RNA) delivers genetic instructions to the location in a cell where protein is synthesized. RNA regulates protein synthesis. Some scientists think that RNA was the first replicating molecule. Q: Name the two types of nucleic acids. Choices: - isoleucin and leucine - dna ( trigraph acid ) and rna ( ribonucleic acid ) - lysine and methionine - dna (deoxyribonucleic acid) and rna (ribonucleic acid) A:
Answer: dna (deoxyribonucleic acid) and rna (ribonucleic acid)
*Question*
Answer the following question given this paragraph: The earliest vertebrates were jawless fish. They evolved about 550 million years ago. They were probably similar to modern hagfish (see Table above ). The tree diagram in Figure below summarizes how vertebrates evolved from that time forward. Q: The earliest vertebrates were jawless what? Choices: - mammals - dinosaurs - reptiles - fish A:
**Answer**
fish
Q: Answer the following question given this paragraph: The chloroplast is the site of photosynthesis. Part of the photosynthesis reactions occur in an internal membrane within the organelle. The chloroplast contains many of these internal membranes, making photosynthesis very efficient. These internal membranes stack on top of each other, just like a stack of pancakes. Q: What structure, containing many internal membranes, is the site of photosynthesis? Choices: - ribosome - mitochondria - genome - chloroplast A:
A: chloroplast