What element is required to build red bloold cells?

Iron
Zinc
Copper
Nickel

Individuals do not compete directly for resources, but are prey for the same predator

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

What is the process by which biological parents pass traits such as hair type or eye color to their children