A codon is a sequence of three nucleotides in DNA or RNA that codes for either a particular amino acid or tells the cellular machinery to start or stop using the code. It isn't located anywhere specific.
The correct answers are options:
1. Amphibians evolved before land reptiles.
4. Elephants appear in the fossil record after dinosaurs became extinct.
The relative dating is a technique of dating with respect to any past event. In this case, two events are discussed to be occurred in a sequence related to one-another. In the option 1, the amphibians are said to be evolved before reptiles. So, the evolution of the amphibians is relatively dated with the evolution of reptiles. Same in the option 4, the evolution of the elephants is relatively dated with the extinction of the dinosaurs.
The correct statement is :
Excretory system excretes waste materials from the body and is very important for homeostasis.
Answer: True
Explanation:
The given statement is true that the waste material that is produced inside the body needs to be excreted out.
This is an important part o the homeostasis that the waste should be excreted out of the body on time. This helps in maintaining equilibrium inside the body.
If the waste material are not excreted outside the body and remains inside the body then it cause disease inside the body.
So, the correct answer is True.
Approximately twenty-five elements occur naturally on earth. Remaining elements either have to be synthesized or obtained through chemical reactions.
