What is the primary hypothesis for the extinction of large mammals such as mammoths?
hunting by humans
break-up of pangaea
climate changes
diseases

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell