Answer:
Indpendant veriable cigarette smoking on lung cancer.
Dependant veriable:The number increase
Explanation:
Lungs appear collapsed in the fetus because they are filled with amniotic fluid and they have never been inflated with air yet.
Answer:
When calcium concentration increases during depolarization, it shifts the conformation of troponin and tropomyosin, and actin is able to associate with myosin. As calcium is taken up again by the sarcoplasmic reticulum the muscle cell relaxes.
D is the answer. A gene is a part of a chromosome.
I think it would be the sclereids cells
