Answer:
one of the major function of the skin is a production of vitamin d false.
Answer:
estimated 1 million gallons per day
Answer:
Any living or non-living thing trying to take flight will have two forces working against them: gravity and drag. Gravity is the force that the Earth exerts on all things pulling them back towards its centre. ... Birds also have two forces that help them in their attempts to take flight.
Explanation:
The correct answer is a - silicon dioxide.
Diatoms are single celled algae. They have a silica - based cell wall called a frustule, which gives each diatom a particular shape.
Diatoms exist as separate single cells although some may be found in groups or colonies. The ones found in colonies create very pretty forms: leaf shaped, oval , star and even like a period.
Outer shells of diatoms are quite valuable. They are used in industry in the manufacture of toothpaste to give it grit.
True. A human haploid cell contains contain only one complete set of chromosomes (23). Meanwhile, a diploid cell has 2 set of chromosomes from the parents, thus containing 46 chromosomes.
