Which element is most important for adding strength to hair, feathers, and outer skin?

oxygen

hydrogen

sulfur

phosphorus

A hydrocarbon has a molecular formula c3h8 what class does it belong to

What is the path that blood takes through the blood vessels and back to the heart?

Hydra are marine organisms that reproduce by the offspring, simply, growing out of the parent organism. The parent organism does not require a mate, and therefore, genetic variation is reduced. Which choice best describes this form of reproduction

Which of these is the result of a government-regulated natural monopoly? A. Fewer pricing plans and options for the consumer B. Greater number of service interruptions C. Multiple installations of gas, water, and electric lines D.

Which genetically engineered medicine is used to control glucose levels in humans?

Water which is returned to the environment after secondary treatment is known as:

Which tool is best used to predict the outcome of various genetic combinations?

What part of the brain consists of two large hemispheres?

How many Calories are in 1 serving cup skin milk? n

What female reproductive organ transports oxygen directly to the embryo?