You conclude that the sucrose solution is hypotonic to the potato cells.
Explanation:
A solution is said to be hypotonic with respect to other solution if its concentration is less than the other solution to which it is compared.
A concentration of solvent molecule in a hypotonic solution is higher than hypertonic solution so solvent moves from hypotonic to hypertonic solution due to osmosis.
The increase in weight of potato shows that it has gained water i.e. the water has entered from the sucrose solution to cells. So, the sucrose solution is hypotonic to the cell sap.
Abiotic factor means no living so your answer is water :)
Answer:
Your heart changes its rate depending on the activity, so that it can carry blood to your muscles, and therefore it needs to beat stronger if you are performing some exercise, or not so strong if you are sleeping, for example.
Explanation:
Your heart is continuously beating to keep blood circulating throughout your body.
So, here it is why your heart changes its rate: Its rate changes depending on your activity level; it is lower while you are asleep and at rest and higher while you exercise to supply your muscles with enough freshly oxygenated blood to keep the functioning at a high level.
And how: depending on your activity level, your heart has to pump enough blood to your muscles. Blood carries needed oxygen and other nutrients. Muscles need more blood sugar than any other tissue especially when working hard. To supply your muscles with oxygen your heart needs to beat faster, and this builds up your heart muscles.
