Q: Q: Which germ layers are essential for animal embryos to grow and develop into a body? Choices: - histone and melatonin - keratinocytes , ectoderm , mesoderm - cytoplasm and chloroplasm - endoderm, ectoderm, mesoderm A:
A: endoderm, ectoderm, mesoderm

Q: Q: What is a fluid-filled body cavity that is completely enclosed by mesoderm called? Choices: - pseudocoelom - hymenium - choroid - coelom A:
A: coelom

Q: Q: Plants can absorb inorganic nutrients and water through their root system, and what gas from the environment? Choices: - hydrogen dioxide - nitrogen dioxide - chemical dioxide - carbon dioxide A:
A: carbon dioxide

Q: Q: What is the term for the measure of the force of gravity pulling down on an object? Choices: - mass - density - pressure - weight A:
A: weight