Q: In science, we need to make observations on various phenomena to form and test what? Choices: - assumptions - theories - variations - hypotheses A:
hypotheses

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: 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: 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*
Q: The earliest vertebrates were jawless what? Choices: - mammals - dinosaurs - reptiles - fish A:
**Answer**
fish

Q: Q: What structure, containing many internal membranes, is the site of photosynthesis? Choices: - ribosome - mitochondria - genome - chloroplast A:
A: chloroplast