Sodium chloride is made up of a positive sodium ion and a negative chloride ion. therefore, it is an example of

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

Is there any solid scientific evidence that humans have been cloned?

Ascientific idea becomes valid when it is what?