Q: Rainwater absorbs carbon dioxide (co 2 ) as it falls. the co 2 combines with water to form what? Choices: - carbon monoxide - nitrate acid - methane gas - carbonic acid A:
carbonic acid

Q: What types of genes encode transcription factors? Choices: - glycosyl transferases - isozyme genes - rohail genes - homeobox genes A:
homeobox genes

Q: The heart and a network of blood vessels that run throughout the body make up what organ system? Choices: - lymphatic system - respiratory system - immune system - cardiovascular system A:
cardiovascular system