1. Please help me I will mark brainest if it is right A book sitting on a shelf has a potential energy of 9800 J and is sitting at a height of 10 m. What is the book’s mass?

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.

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.

i wish i could with all of them i can barley see the first one so here's the answer to the first one b