A scientist claims that after the first single-celled organisms formed on Earth, conditions would not sustain multicellular organisms for millions of year. Which statement provides the STRONGEST evidence to support this claim

A. Earth's early atmosphere lacked oxygen, which multicellular organisms need to break apart food

B. Earth's early atmosphere lacked nitrogen, which multicellular organisms need to synthesize proteins

C. Earth's surface was much too hot to support liquid water, which multicellular organisms need to survive

D. Earth's surface was much too cold to support liquid water, which multicellular organisms need to survive

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.

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above

The cell membrane controls what enters and leaves the cell. which of the structures in the diagram below is the cell membrane? — f оооо