What kind of scientific investigations do not involve observations

What are small unopened or plugged sebaceous glands that occur in a newborn's mouth and gums?

In one sentence, describe the relationship between monomers and polymers

The body uses two types of digestion, mechanical and chemical, to break down food into small components. Mechanical digestion physically breaks down pieces of food, whereas chemical digestion breaks down food on the molecular level.

Which of these is an example of the action of an endocrine disruptor? bpa in bottles affects particular glands. feedback from estrogen inhibits fsh. lack of iodine prevents synthesis of adequate thyroid hormone.

A girl received one recessive allele for blue eyes from her father and a recessive allele for blue eyes from his mother. Which of the following best describes the girl's genetic type?

The speed of neural impulses along an axon is increased greatly by

True or false: the northern lights are caused by earth magnetic field

Which of the following is a function of the nucleus? A) stores DNA B) stores sugars C) builds proteins D) packages proteins

Animals are motile because they have: a. energy b. metabolism c. nerve and muscle fibers d. legs or wings

Radiation generated by the big bang cooled and is now detectable as microwaves. t/f