The major chemical in middle lamella is, Select one: O A. cellulose O B. lignin O C. pectin O D. hemicellulose​

human-caused climate hope this

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.