An aquatic egg and larva are ancestral characters of anurans, but terrestrial eggs and even direct development that bypasses the larval stage entirely have evolved independently in many lineages of anurans
Why didn't all lineages evolve that way? That is, why might it be advantageous for a species of frog to have retained an aquatic egg and a larval stage?
Many hypotheses are plausible and mutually compatible. Here are two: (1) Species with complex life histories exploit the resources of two different ecological niches during their lifetime, reducing the potential for competition between juveniles and adults. (2) Newly hatched amphibians are generally too small to be ecologically equivalent to adults.
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Which DNA sequence can encode the amino acid sequence ile-asp-ser-cys-his-tyr?
A. TAGCTGTCAACAGTGATA B. TAACTAAGTACGGTGATG C. TAACTGTCGACGGTGATG D. All of the answer choices are correct
Disease is often considered the result of
A. negative feedback.?B. failure of homeostatic systems.?C. maintenance of set point.?D. feedback loops.
What percentage of ventricular filling is normally accomplished before atrial contraction begins?
a. 0% b. 20% c. 80% d. 50% e. 100%
Cells synthesizing large quantities of proteins would have numerous nucleoli.
Answer the following statement true (T) or false (F)