Answer:
Rats and Humans both live on land during all life stages.
Explanation:
I think this because rats don't live in water or anything like that during their lifetimes. Humans also don't live in water during their lifetimes. So that is how I know that they share living on land during all life stages characteristic.
B. trna molicules check the amino acid for errors
The presence of mineral surface for the amino acid to adhere to may have aided the polymerization of amino acids into peptides in the oceans of early prebiotic earth.
Amino acids are the building bocks of protein. The structure of an amino acid comprises of a carboxylic group, an amino group, a hydrogen atom and a variable R-group attached to the same alpha-carbon atom. There are 22 types of amino acids involved in the formation of proteins.
Prebiotic earth refers to the Earth that existed before the origin of life. The environment of earth was completely different from now. The temperature was extremely hot with no oxygen, abundant of water bodies and ionizing radiations from the space.
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Answer:
The word ‘comet’ comes from the Greek komhth comètè (long-haired), from which we also get the word ‘comb’. Loosely, a comet appears as a hairy star. For millennia comets have been associated with disasters. Two examples are the apparitions of Halley’s Comet during the Battle of Hastings in 1066 and the destruction of Jerusalem in AD 70. Comets really do appear mysterious. While the stars, the Sun, the Moon, and the five naked eye planets all follow regular and predictable motions, comets appear suddenly, quickly move in an erratic fashion, and then abruptly disappear, apparently never to be seen again.
Comets contain dust, ice, carbon dioxide, ammonia, methane and more. Astronomers think comets are leftovers from the material that initially formed the solar system about 4.6 billion years ago.
Explanation:
