What could the hardness of a mineral be if it can be scratched by your fingernail?

Dna replication or repair occurs in a cell in all of thw following situations except when

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.