Answer: 1
Explanation: Simple sugars are not formed during cellular respiration.
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Oil and water separate because they have different densities.
Answer
Hi,
A. Radioactive markers
Explanation
Hershey and Chase used specific radioisotopes to form a trace of the two important components of the virus in its life cycle. The 32P was used to identify the DNA while the 35s labeled the proteins.DNA strands have a sugar phosphate where as protein contains sulfur.
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