If you scratch a mineral sample with your fingernail, a knife blade, or glass, what property are you testing?

luster

streak

acid effervescence

hardness

What is mitosis and how does it affect change

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.