the first answer as blood needs to be oxygenated to be passes round the body then when its deoxgenated it will return to the heart to be pumped around the body again
E. Sounds like all e are the same <span>E.I, II, and III</span>
Answer :
When lava pushes the crust upward but hardens before erupting onto the surface, dome mountains are formed. The wind and rain pummel the domes, carving up peaks and valleys.
Answer:
Chromosomes condense before mitosis to allow them the ability to move smoothly, without becoming entangled and breaking. (So, they are conveniently packaged for cell division, in which the chromosomes must move to both poles of the cell.)
Explanation: Otherwise it would be a massive mess to untangle and separate like a meesed up fishing reel jammed with line mixed together with the jammed lines from 3000 other messed up lines
Answer:
Mass extinction occur when the environment is not favourable.
Explanation:
Mass extinctions occur on the earth when there is sudden change in the environmental conditions for an organisms that is not good for the survival of that particular organisms so they extinct from the earth surface. The example of mass extinctions are dinosaurs. These dinosaurs were extinct due to change in their environment that decreases the availability of food for them so due to no available food, the dinosaur extinct from the earth.