It is "preserved" by sediments. (C)
Answer:
In evolutionary biology, abiogenesis, or informally the origin of life (OoL), is the natural process ... For the oldest life forms, see Earliest known life forms. ... There are several principles and hypotheses for how abiogenesis could have occurred. ... In 2017 scientists found possible evidence of early life on land in 3.48 Gyo
Explanation:
Many scientists favor the RNA world hypothesis, in which RNA, not DNA, was the first genetic molecule of life on Earth. Other ideas include the pre-RNA world hypothesis and the metabolism-first hypothesis. Organic compounds could have been delivered to early Earth by meteorites and other celestial objects. We can only speculate about these questions, since we haven't yet found any life forms that hail from off of Earth. But we can think in a more informed way about whether life might exist on other ... When did life appear on Earth? ... For many millions of years, early Earth was pummeled by asteroids and other celestial objects.
Answer:
Otros científicos incluyen: Niels Bohr, J.J. Thompson, Ernest Rutherford, James Chadwick y Ernest Schrodinger
Explanation:
El modelo de Bohr se centró en el núcleo del átomo rodeado de electrones que giran a su alrededor. J. J. Thompson propuso electrones rodeados por alguna carga positiva para equilibrar el poder de los electrones que estaban cargados negativamente. El modelo de Ernest Rutherford propuso que los protones y los neutrones residían dentro del núcleo del átomo con los electrones distribuidos alrededor del núcleo. A James Chadwick se le atribuyó el descubrimiento de neutrones (que poseen carga neutral) en su modelo, contribuyendo así al modelo atómico. Ernest Schrodinger avanzó el modelo de Bohr al indicar claramente los orbitales a través de los cuales los electrones giran alrededor del núcleo de un átomo.
Answer: Time= independent Grade= Dependent
Explanation: Time is independent and the grade is dependent on time.
Answer:
Sickle cell disease is due to a type of substitution mutation.
Explanation:
Sickle cell disease is a condition that is transmitted from parents to children in an autosomal recessive inheritance pattern. It is due to a mutation that is capable of altering the shape of the erythrocyte, as well as its ability to circulate and carry oxygen.
The mutation that occurs in sickle cell disease is due to an alteration in the β-chain of hemoglobin, caused by the substitution of thymine base by adenine in the DNA that determines it. As a result, valine replaces glutamic acid in the β-chain amino acid sequence, with the consequences described.
- <em>The other options are not correct because </em><u><em>deletion, duplication and translocation </em></u><em>correspond to chromosomal mutations, not responsible for sickle cell disease.</em>
