Epithelial tissue always has a free?

During a blood drive, Shaun noticed that the nurse punctured his vein to connect the tube for withdrawing blood. Why is blood obtained through veins and not from arteries when collecting blood?

Classify each of the following simple carbohydrates as disaccharides or monosaccharides. 1. Fructose 2. Lactose 3. Sucrose 4. Maltose 5. Glucose

What happens during the systole part of the cardiac cycle?

Consider the following two facts: Any localized population of a speces has the potential to produce far more offspring than the local environment can support. Individuals in any population will vary in many hereditary traits.

Which organelle's primary function is to aid in cell division

Color-blindness is more common in men than women, but it's often carried (and passed on) by women who aren't colorblind themselves.

What did astronomer Edwin Hubble discover in 1929? I need it up to 4 sentences

Describe one function that is common to both carbohydrates and lipids.

What is an atom in the human body

Explain the process that creates wind?