Animal phyla are primarily defined according to B. Patterns of embryologic development and adult body plans.
Explanation:
Genetic variation is increased by meiosis
Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I
First stage is peat, then followed by lignite, bituminous and anthracite. Mark as branliest tq
These three groups are monotremes, marsupials, and the largest group, placental mammals.
