Which of the following is an autotroph?
a mushroom
b flatworm
c human
d cactus​

cactus

Explanation:

this is the answer because a cactus is a plant- most people confuse this with mushrooms b/c they're plants also- the only difference is that they are decomposers- so the feed off of decomposing things

The correct answer is D or cacrus

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.