OPEN ENDED QUESTION
In 2-3 complete sentences, describe how
scientists can use fossil records to show how the
Earth's environment has changed.

structure is maintained and sustained by:

-cytoskeleton: gives cells coherence

-cell wall: support

-cytoplasm: shape

hope this .

maybe because its impossible for balloons to lift a whole entire house.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.