Answer:
A-U
Explanation:
There is no thyamine in rna so we can cancel that out. Adenine pairs with thyamine and Cytosine pairs with Guanine. In RNA though Adenine pairs with Uracil, which is like the replacement for Thyamine.
Not a physical change, It's a chemical change because you can't change the process back to its original state. If it was a physical change, you could change it back to its original state using the boiling, evaporating or melting process.
The correct answer is a - silicon dioxide.
Diatoms are single celled algae. They have a silica - based cell wall called a frustule, which gives each diatom a particular shape.
Diatoms exist as separate single cells although some may be found in groups or colonies. The ones found in colonies create very pretty forms: leaf shaped, oval , star and even like a period.
Outer shells of diatoms are quite valuable. They are used in industry in the manufacture of toothpaste to give it grit.
Poaching refers to the illegal taking of wildlife, in violations of laws that regulate wildlife hunting. Examples of poaching includes; killing an animal out of season, hunting without appropriate licensing, using prohibited weapons to hunt animals, etc.
Over utilization of a specie refers to the near-extinction or extinction of a particular species as a result of incessant killing. Poaching can lead to a situation where a particular animal specie will be completely wipe out as a result of excessive, inconsiderate killing. The extinction of a particular animal specie may have negative effects on the local environment. <span />