Answer:
C. The lungs
Red blood cells pick up oxygen in the lungs. Blood travels away from the heart and lungs through the arteries. Red blood cells drop off oxygen to the cells through tiny tubes called capillaries. Blood then returns to the heart through the veins and the cycle begins again.
<span>B is the correct answer. Carbon dioxide is a compound of two elements, carbon and oxygen. There are two oxygen molecules for every carbon molecule in the compound. </span>
Answer:
Explanation:transcription is the transfer of genetic information from DNA to mRNA, which can be translated to a functional protein. Eukaryotic transcription occurs in the nucleus. The process starts when RNA polymerase regonises certain transcription factors upstream of the promoter region. binding of RNA polymerase to these transcription factors in addition to other molecules form the basal transcription factor. The enzyme then moves from 5' to 3' of the template strand (strand to be transcribed) adding corresponding nucleotides to form the new RNA strand (pre mRNA). The newly synthesized RNA then undergoes three basic steps ( capping, polyadenylation and splicing) to become a mature translatable mRNA.
Answer:
c
Explanation:
seas water isn't fresh water
