The nervous system is the body’s switchboard, sending signals between different parts of the body. the central hub of the nervous system is the brain. the brain is an example of which level of hieratical organization within the body?

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

What makes a dominant allele different from a recessive allele