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ziro4ka [17]
3 years ago
11

Why don’t we have a complete fossil record of all life that’s ever lived?

Biology
2 answers:
Ivanshal [37]3 years ago
8 0

Answer:

Why don't we have a complete fossil record of all life that's ever lived? Fossil formation requires a rare mix of physical and biological conditions. Fossils must be exposed at Earth's surface to have a chance of being found. Fossils can be destroyed when rocks erode, melt, or change composition.

Explanation:

For many reasons, the fossil record is not complete. Most organisms decomposed or were eaten by scavengers after death. Many species lacked hard parts, which are much more likely to fossilize. Some rocks and the fossils they contained have eroded and disappeared.

Please mark me as the brainliest

Bess [88]3 years ago
6 0

Answer:

Sediment has to cover the bones in order for fossilization to take place

Explanation:

Fossil formation requires a mix of physical and biological conditions. Fossils have to be exposed in oder to find them too, so there might be some that are just too deep in the earth for us to find them

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Beneficios y desventajas de la modificación genetica
finlep [7]
La manipulación genética representa todas aquellas técnicas que permiten modificar de forma directa los genes en el interior de las células de los organismos vivos. Estas modificaciones pueden ser a través de la inserción, la eliminación o la alteración de uno o más genes específicos. Todas las instrucciones que hacen que un organismo sea lo que es están codificadas en los genes, es decir que estos fragmentos de ADN son los que le indican a cada parte de las células y a cada célula en el cuerpo de un organismo multicelular o unicelular, qué debe hacer, cuándo y cómo. La manipulación genética es uno de los procesos científicos biotecnológicos más empleados hoy en día, ya que incluye todas las herramientas necesarias para modificar las características físicas de prácticamente cualquier ser vivo o, mejor dicho, de todo lo que tenga información genética en su interior (ADN o ARN).

Hoy en día la manipulación genética es uno de los temas más discutidos por la sociedad científica, pues existen herramientas biotecnológicas capaces de manipular de manera fácil y efectiva casi cualquier gen que se desee en un organismo Entre los organismos que se pueden “manipular genéticamente” se incluye al ser humano, y es allí donde surgen la mayoría de los debates, ya que a pesar de que la manipulación genética puede ayudar a curar un gran número de enfermedades hereditarias, también puede utilizarse para crear armas biológicas sumamente peligrosas.



3 0
3 years ago
What does solubility mean?
wolverine [178]
For example salt in water ,salt would dissolve ,you won't be able to see it but if you taste it it would still be there

dissolve /disappear but still be there
4 0
3 years ago
Which of the following statements about aldosterone is NOT correct?- Aldosterone is stimulated by decreased plasma sodium levels
lisov135 [29]

Answer:

C. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.

Explanation;

  • Aldosterone hormone is produced by the adrenal gland and mainly carries out its functions in the kidney.Through the aldosterone hormone the body is able to retain more water for the kidney is able to hold more sodium.
  • When the plasma sodium levels decrease and the plasma potassium levels increase the production of aldosterone hormone is stimulated for sodium is needed in the .body to maintain the high water levels in the body.
3 0
3 years ago
Impacts of fracking include
nasty-shy [4]

Answer:

D is the answer

Explanation:

Hydraulic facturing, aka fracking, uses toxic chemicals above some regulations which may lead to a leak into water supplies and therefore contaminate it.

It has not much to do with coal, more to do with oil and natural gases

Because of fracking now making it accessible to reach sources in vast number that were previously unacessible, it leads to decreases in gas prices

Hope this helps :)

3 0
3 years ago
Which of the following is true about environmental tobacco smoke (ETS)?
qaws [65]

Answer:

ETS is responsible for more lung cancer deaths than heart disease deaths annually

4 0
3 years ago
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