Which of the following are most likely to be keystone species in an ecosystem?
a. small-bodied, primary consumers
b. symbionts
c. large-bodied, higher level consumers.
d. producers

I think species that are most likely to be in the ecosystem are D. producers

Ifound this on google “concept 13: meiosis ii: telophase ii. a nuclear envelope forms around each set of chromosomes and cytokinesis occurs, producing four daughter cells, each with a haploid set of chromosomes. a nuclear envelope forms around each set of chromosomes.” i hope this you for what your looking for.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem