Answer:
There must be an independent variable, which changes throughout the course of an experiment; a dependent variable, which is observed and measured; and a controlled variable, also known as the "constant" variable, which must remain consistent and unchanging throughout the experiment.
Explanation:
Answer:
A. Provided the major energy source used by mitochondria
There have been 5 mass extinctions in the history of Earth, the main two are the K-T extinction (75% of the world organisms were killed) and the great paleozoic extinction. Scientists believe a massive meteorite caused the KT extinction but could also have been caused by some traps in India. The paleozoic extinction was believed to be caused by traps in Siberia which effected the temperature and atmospheric conditions of the tune
Answer:
The correct answer is d. IgG
Explanation:
During pregnancy the fetus is attached to the mother body by placenta and IgG is the only antibody which can cross the placenta and reach the fetus. This antibody is very important for an infant to get protection from infections.
Measles is a viral disease that usually infects infants who are not vaccinated against it. Until the vaccination is done the infant is protected by the passive immunity given by his mother through passing the IgG antibody.
This maternal antibody is capable of protecting infants for the first six months of life after which vaccination is required to protect the infant from measles.
The answer is central canal and it basically is in the center of the spinal cord in which csf flows from the brain to the lower end.