How does the shape of a pyramid relate to the number to the number of groups in each level of the Linnaean classification system?

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

Can someone i have no idea of how to do this.

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits