Which of the following statements about a compound is true?
a. the physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
b. only the physical properties of a compound are usually the same as those of the elements from which it is formed.
c. only the chemical properties of a compound are usually the same as those of the elements from which it is formed.
d. the physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.

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 kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

Which layer will become saturated first when rain falls?