A 75 year old man need a replacement heart valve. he lives alone and cares for himself. is a mechanical or biological heart more suited for him

What is the main source of fuel in developing countries

There is a higher sodium concentration on the inside of the cell than there is on the outside of the cell. How will the sodium particles move and by what process? Sodium will move from the inside of the cell to the outside of the cell by osmosis.

Where is the air pressure greater-at sea level or on a mountaintop? Explain.

The focus of an earthquake is a place within Earth along a fault at which you feel the last movements of the earthquake. True False will give brainliest

What does the shadow used by sundial to tell time look like in the morning, midday and evening

What genetic mutation is sickle cell anemia caused by?

The opening and closing of the heart valves is caused by action potentials within the cusps of the valves. contraction of the smooth muscle in the walls of the great vessels leaving the heart.

What is systematics and why is it a less arbitrary and more natural approach to categorizing living organisms?

Think about the following items: a candle flame, a balloon floating in the air, and bubbles blown from a bubble wand. Describe characteristics that could indicate life in these items, and characteristics that show they are not alive.

If a person wanted their child to have 6 fingers on each hand, explain how you think a doctor would be able to accomplish this