2) Which is true about UVA and UVB rays?
A Both rays can be blocked
100% by sunscreen
B. UVA protects the surface, UVB
protects beneath the surface
C. UVB rays cause burning. UVA
rays cause premature aging
D. UVA rays cause burning. UVB
rays cause premature aging

where is the scientific experiment?

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

synapse nervous system