Q: What layer of soil usually does not have very small particles like clay? Choices: - undersoil - sediment - silt - topsoil A:
topsoil

Q: What is the major source of warmth for earth? Choices: - the Moon - seasons - equator - the sun A:
the sun

Q: Q: Red-green color blindness is an example of a sex-linked condition caused by what? Choices: - phenotype - dominant gene - genetic disorder - recessive allele A:
A: recessive allele

Question: Q: Exposure to toxins is most damaging during weeks 4 through 8 of the embryonic stage due to development of what during this period? Choices: - samples - faith - pain - organs A:
Answer: organs

*Question*
Q: Minerals are grouped based on what? Choices: - carbon composition - mineral composition - density - chemical composition A:
**Answer**
chemical composition

Q: Q: What involuntary muscle is found only in the heart? Choices: - physiological muscle - respiratory muscle - digestive muscle - cardiac muscle A:
A: cardiac muscle