Which of these is a characteristic of index fossils?
a/found in the topmost rock layer.
b/found in many layers of the same rock.
c/have already established relative age.
d/are limited to a particular geographic location. (hu)

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

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.

answer; coat color for blending in with dry grass;