Which event happened first in earth’s evolution on the geologic time scale? energy from collisions melted materials that became earth’s core. the sun released a strong burst that destroyed the first atmosphere. a ball of dust, ice, and rock was pulled together by gravity. dense materials hardened to form the crust and mantle.

As soon as possible this assignment is due in 5 minutes atoms in a molecule are bonded together by sharing, gaining, or a. photons b. protons c. neutrons d. energy f. electrons

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

Identify the structures ! 20 points