ASAP BRAINLIEST AND 1000 POINT Which statement is true about copper and salt?

Both are mixtures.
Both are pure substances.
Copper is a mixture and salt is a pure substance.
Copper is a pure substance and salt is a mixture.

Which two factors contributed to creating a global culture? the creation of the united nations improvement in telecommunications health issues such as the ebola virus increased opportunities for global travel

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative