Propose an explanation for why annelids and arthropods were thought to be closely related, before phylogenetic analyses in the late 1990s.

One trait that is shared by the Lophotrochozoa and Ecdysozoa is .

Which protostome phyla successfully made the transition from water to land? Select True or False for each phylum.T/FMolluscaT/FArthropodaT/FAnnelidaT/FNematoda

A plant with orange, spotted flowers was grown in the greenhouse from a seed collected in the wild. The plant was self-pollinated and gave rise to the following progeny: 88 orange with spots, 34 yellow with spots, 32 orange with no spots, and 8 yellow with no spots. What can you conclude about the dominance relationships of the alleles responsible for the spotted and unspotted phenotypes? What can you conclude about the genotype of the original plant that had orange, spotted flowers?

Which of the following groupings includes the largest number of species? (Explain your answer.)a. invertebratesb. arthropodsc. insectsd. vertebrates

In peas, purple flowers are dominant to white. If a purple-flowered, heterozygous plant were crossed with a white-flowered plant, what is the expected ratio of genotypes and phenotypes among the F1 offspring? If two of the purple-flowered F1 offspring were randomly selected and crossed, what is the expected ratio of genotypes and phenotypes among the F2 offspring?

Use your understanding of insect evolution to predict two adaptations for terrestrial living that occurred in spiders.

Molecular comparisons place nematodes and arthropods in clade Ecdysozoa. What characteristic do they share that is the basis for the name Ecdysozoa?a. a complete digestive tractb. body segmentationc. molting of an exoskeletond. bilateral symmetry

Pose a hypothesis to explain why the evolution of the wing was such an important event in the evolution of insects.