What kind of atoms typically have unstable nuclei?

a. atoms with a neutron count less than 90
b. atoms with a neutron count greater than 90
c. atoms with a proton count less than 90
d. atoms with a proton count greater than 90

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.