1)¿Cuáles son los sentidos comunes que se pueden utilizar, para identificar un metal, gases o líquido?

The question is another language. Translation in English language is as following:

What are the common sensors that can be used to identify metal, gas or liquid?

Common sensors that can be used to identify metal, gas or liquid are as following:

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101