what function did molecular signals and receptors have in the protistan ancestors of complex organisms?

Suppose you discover a new species of animal that does not have body segments, but is triploblastic, coelomate, and cephalized. Under the molecular phylogenetic scheme, you would allocate it to which phylum? A)Platyhelminthes. B)Arthropoda. C)Nematoda. D)Mollusca. E)Echinodermata.

What is germplasm? Why is it necessary to have gemplasm collection?

According to the phylogeny presented in this chapter, whichprotists are in the same eukaryotic supergroup as plants?(A) green algae(B) dinoflagellates(C) red algae(D) both A and C

What is a phylum that is no longer considered for the rank of phylum and was demoted to family?

A group of environmentalists is studying the effects of recent commercial zoning to wildlife acreage on the biodiversity of a rural county. The group noted a steady decline in the population of animals, while bacteria and other protists remained constant. Which statement best discusses the reasons for the steady decline of animals as opposed to the protists? A. Bacterial growth is usually not affected by environmental changes because of asexual reproduction. B. The animals could not adapt to the new environment. C. Bacteria lived in areas that were not affected by the zoning D. The animals became susceptible to human and environmental harm.

How have modifications in the feeding appendages of arthropods helped them thrive successfully on Earth?

does the earthworm (Oligochaeta) contain any synapomorphies?

Plastids are specialized storage organelles found in plants. Which of the mismatched according to the function of the plastid? bilowing is O A) amyloplast: starch O B) chromoplast:carotein C) chromoplast:chlorophyll D) vacuole:anthocyanin O E) chloroplast:chlorophyll 身

What do fossil tetrapods tell us about the transition from water to land?