From whom does a male zygote inherit an x chromosome

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

Average annual precipitation and are the two major features that define the biomes on earth.

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants