2 1.1.4 Quiz: The Scientific Process Question 6 of 10
How is a scientific theory developed?
A. An experiment is repeated several times.
B. Many different experiments are performed and repeated.
C. One scientist proves his hypothesis with an experiment.
O
D. A single experiment is performed once.
SUBMIT

Scientific theories are created through the process of the scientific method. Observation and research lead to a hypothesis, which is then tested. ... Over time, a hypothesis can become a scientific theory if it continues to be supported by additional research.

the answer is b.) hydrogen bonds between bases.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.