Which of the following statements is generally true of aneuploidies in newborns ? O An aneuploidy resulting in the deletion of a chromosome segment is less serious than duplication . Monosomy X is the only viable monosomy known to occur in humans Amonosomy is more frequent than a trisomy . Human aneuploidy usually conveys an adaptive advantage in humans .​

What are two reasons for why a species might disappear from the fossil record?

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression. c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression. d-neelaredoxin is only produced when there is exposure to o2 or h2o2.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important