Please select the word in parentheses that fits the sentence: A catalyst [weakens/strengthens] the bonds of the reactants [increasing/decreasing] the activation energy.

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:

the tricuspid valve is present between right atrium and right ventricle

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

im not intirely sure but i think the anwser is d relative humidity