When a helium balloon rises in the air, it expands. if the volume of the balloon doubles, what happens to the density of the helium inside it
a. the density decreases by half.
b. the density doubles.
c. the density stays the same.
d. the density triples

What does natural resource management aim at ?

Me the formula cacl2 represents the compound

Parthenogenesis is a type of reproduction that does not require a mate. it’s rarely seen in birds and higher vertebrates. parthenogenesis involves the formation of a zygote. but this zygote is formed without fertilization. in parthenogenesis, in the absence of a male gamete, the ovum develops directly in the zygote.