The cartoon shows Metaphase I.
Metaphase I has homologous chromosomes that line up at the middle while Metaphase II has single chromosomes that line up at the middle.
Tentative means possible
So a possible explanation of any matter on whuch you are working will be called astentative explanation which may be correct or incorrect
Complex organic food molecules such as sugars, fats, and proteins are rich sources of energy for cells because much of the energy used to form these molecules is literally stored within the chemical bonds that hold them together. Scientists can measure the amount of energy stored in foods using a device called a bomb calorimeter. With this technique, food is placed inside the calorimeter and heated until it burns. The excess heat released by the reaction is directly proportional to the amount of energy contained in the food.
When contracted the Right Atrium pumps deoxygenated blood into the Right Ventricle below via the Tricuspid Valve.
It's the mitochondria, the "powerhouse of the cell".
