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Shkiper50 [21]
3 years ago
13

What's on our skin that prevents bacteria and viruses from entering?

Biology
1 answer:
USPshnik [31]3 years ago
7 0

Answer:

The skin itself acts as a barrier between pathogens and your body.

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Si se aparean especies diferentes como por ejemplo el cruce entre caballos y burros; podemos afirmar que si llegan a tener desce
White raven [17]

Answer:

El híbrido va a ser esteril.

Explanation:

En la cruza entre dos especies distintas, cuando ocurre, existen distintos mecanismos de aislamiento reproductivo, que son barreras que inhiben o interrumpen el flujo génico entre especies distintas. Es decir que no habrá exito reproductivo de estas cruzas. Se trata de caracteres biológicos propios de cada especie que previenen la reproducción con otras especies.

Estos mecanismos de aislamiento reproductivo pueden ser precigóticos o postcigóticos.  

  1.Pre-copulatorios o pre-cigóticos:

  • Ecológico o por aislamiento de hábitat;
  • Estacional o temporal;
  • Sexual o etológico;
  • Mecánico;
  • Por incompatibilidad de gametas.  

  2. Post-copulatorios o cigóticos:

  • Inviabilidad del híbrido;
  • Esterilidad del híbrido;
  • Híbrido con viabilidad o fertilidad disminuido;
  • Interacciones citoplasmáticas.

La mula es producto de la cruza entre dos especies distintas: una yegua (Equus ferus caballus) y un burro (Equus africanus asinus). Es un ejemplo de la accion de mecanismo poscigótico, en el cual se forma un híbrido viable esteril. Este ejemplar puede nacer, crecer y sobrevivir, pero que no puede producir gametas funcionales, por lo cual no puede reproducirse.  

7 0
3 years ago
Rachel is studying the impact of watching television 30 minutes before bedtime on quality of sleep. Which of the following might
rodikova [14]

Answer:

''Watching television adversely impacted the quality of sleep''.

Explanation:

''Watching television adversely impacted the quality of sleep'' is the best hypothesis for her study. Watching television right before bed, can negatively impact your sleep quality. Late-night watching television disrupts your internal clock that adversely affected sleep quality of an individual. The above hypothesis is used by the Rachel to investigate the impact of watching television before sleeping on the sleep quality.

4 0
3 years ago
The pancreas produces all of the following digestive enzymes except:
ryzh [129]

Answer: the answer is C

Explanation:

Pancreatic proteases (such as trypsin and chymotrypsin) - which help to digest proteins.

4 0
3 years ago
When completing the water properties lab, which property of water was reasonable for the water molecules sticking to the penny?
BaLLatris [955]

Answer:

Water has adhesive force between it's molecules and the penny s molecules

Explanation:

Hope it helps

8 0
4 years ago
Which of the following statements about the compound HCI is true?
sukhopar [10]
Answer.
The answers is A; The physical and chemical properties of HCl are different from those of H2 and Cl2.

Explanation; 
Hydrogen chloride is a gas, which is a molecule made up of a hydrogen and a chlorine atom bonded by a single bond. 
The chemical and physical properties of HCl differs from those of hydrogen and chlorine. For example; they have different molecular weight; HCl is colorless, while chlorine is greenish yellow and hydrogen is colorless
8 0
3 years ago
Read 2 more answers
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