What is the ultimate cause of cancer

Genes became mutated and caused cancer

the main cause is gene mutation some causes of gene mutation are smoking, radiation, viruses, cancer-causing chemicals, obesity, hormones, chronic inflammation and a lack of exercise.

the correct option is option a

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: