Which of these characteristics does not apply to cnidarians? a. are diploblastic b. possess a gastrovascular cavity with one opening c. undergo metamorphosis d. have a central nervous system
Pose a hypothesis to explain why the evolution of the wing was such an important event in the evolution of insects.
Verified Solution
Key Concepts
Evolutionary Adaptation
Flight Mechanics
Ecological Diversification
Propose an explanation for why annelids and arthropods were thought to be closely related, before phylogenetic analyses in the late 1990s.
Use your understanding of insect evolution to predict two adaptations for terrestrial living that occurred in spiders.
Which of these choices is an example of homology (similarity due to common ancestry)? a. suspension feeding in sponges and clams b. ectoparasite lifestyle in aphids and ticks c. cnidocytes (stinging cells) in jellyfish and sea anemones d. radial symmetry in cnidarians and echinoderms
Suppose that a gene originally identified in nematodes (roundworms) is found to be homologous with a gene that can cause developmental abnormalities in humans. Would it be possible to use fruit flies as a model organism to study this gene? Explain.
The pygmy zebra octopus is a potential new model organism for understanding brain function in humans despite the independent evolution of high intelligence in both groups. Describe (or draw a phylogenetic tree to show) the relationships among humans (H. sapiens), the pygmy zebra octopus (O. chierchiae) and two other protostome model organisms in medicine: the fruitfly (D. melanogaster) and roundworm (C. elegans).