Answer: Scientists think that early amphibians had lungs becuase they needed efficient oxygen uptake to support their metabolism. Higher rates of metabolism are needed on land, becuase of this scientist think that early amphibians breathed air with lungs.
Explanation:
Answer:
D) 100 acres
Explanation:
gazelles typically frequent wide open plains and space where they browse on grasses shoots and leaves. open plains make them visible to predators such as cheetah or wild dogs but gazelles are fleet of foots. the Thomson's gazelles can reach a speed of 40 miles an hour. some gazelles population eschew the grasslands for mountainous landscape or even deserts. during the dry season some grassland gazelles will even take to the bush of africa in search of water
Cross over is the first way genes are shuffled to give rise to genetic diversity. Cross over takes place in sexual reproduction. The normal way that cross over occurs is chromosomes line up side by side and break off pieces of themselves, then trade those pieces with each other.
If they break the pieces at the same locus in the sequence of base pairs, the result is an exchange of genes called genetic recombination and it ensures that the daughter cells produced have a different genetic makeup from the parent cell and thus diversity occurs.
Answer:
AUG CAG UUC UUG CGC GAA UAA GCA AU
Explanation:
tRNA pairs with mRNA to make a chain of amino acids that form a protein, through the process of translation. The anti-codons in the tRNA are complementary to the codons in the mRNA. Through the rules of complementary base pairing, A always pairs with T/U and G always pairs with C.
T/U is because in DNA, the base is thymine (T), but in RNA, the base is uracil (U).
Therefore, wherever you see a U in the mRNA sequence, the complementary tRNA is A. Whenever you see an A, the complementary tRNA is U. Whenever you see a G the complementary base is C, and whenever you see a C, the complementary base is G.
