The placenta is the interface between the maternal and embryo's blood, and allows for the exchange of nutrients, including oxygen and carbon dioxide exchange, but prevents certain drugs and chemicals from reaching the embryo. Its a bit like a security guard that only lets certain things though to the baby.
Match each field of study to the correct piece of evidence.
B. Brain and spinal cord
The nervous system is an organ system in charge of sending messages to and from the brain<span> and </span>spinal cord<span> to and from all parts of the body. </span>
Answer:
The spindle fibers form and the nucleus disappears
Explanation:
Because in science, "theory" doesnt mean what it means in everyday language. Scientific knowledge is known as theory. For example, electrical theory, germ theory, evolutionary theory, thermal theory, etc
