Which type of succession takes place where an ecosystem already exists?
evolutionary succession
pioneer succession
secondary succession
primary succession

ANSWER:

Secondary succession takes place where an ecosystem already exists. An ecosystem is made from various plants, animals and life support processes and mechanisms.

EXPLANATION:

bru what tyep of qus is dis

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds