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liq [111]
3 years ago
6

What 4 things help to keep blood flowing through the veins in one direction?

Biology
1 answer:
Elanso [62]3 years ago
7 0

Answer:

Valves in the veins keep blood flowing in the correct direction.

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2) ¿Cuál de los siguientes hechos no es una evidencia de una reacción química? a) Presencia de un catalizador b) Cambio de color
Pepsi [2]

Answer:

a) Presencia de un catalizador

Explanation:

Los dos tipos de cambios que experimentan las sustancias en la química son cambios químicos y físicos.

Un cambio físico es un cambio es un cambio en el que la sustancia cambia en su apariencia o su forma de una manera que es reversible y en la que no se forma una nueva sustancia.

Un cambio químico es aquel en el que hay un cambio en las sustancias presentes y se forma una nueva sustancia.

La evidencia de que ha tenido lugar un cambio químico incluye

1) La formación de un precipitado a partir de la mezcla de sustancias.

2) Un cambio en el color de las sustancias.

3) Un cambio en el olfato (que desprende un olor) o en el sabor.

4) La sustancia produce luz (brilla)

5) El volumen total cambia

6) Cambio de temperatura (la mezcla se calienta o enfría)

Por lo tanto, la presencia de un catalizador, que es una sustancia que no participa en una reacción pero aumenta la velocidad de reacción, no es evidencia de una reacción química.

3 0
3 years ago
How many joules are required to evaporate 1 gram of boiling water
Zarrin [17]
2260 joules are required to evaporate 1 gram of boiling water
8 0
4 years ago
Why is gregor mendel considered to be the father of genetics?
sasho [114]
Hi lovely,

Gregor Mendel discovered the fundamental laws of inheritance and that determined that genes come in pairs.
6 0
3 years ago
How does a gene mutation happen?
Inessa [10]

Answer:

Gene mutations can be caused by environmental factors such as ultraviolet radiation from the sun, or carcinogens due to ionizing radiation. Mutations can also occur if an error is made as DNA copies itself during DNA replication, mitosis and meiosis.

Explanation:

6 0
3 years ago
Explain why water is critically important to most facets of human life.
Llana [10]
Everyone needs water to survive. Just like we need oxygen we need water.
8 0
3 years ago
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