What non-skeletal adaptations allowed fishes to evolve into land dwellers?
What will be an ideal response?
Lungs, which had previously served an accessory purpose, became larger and more complex. Division of the previously two-chambered heart into three chambers allowed blood to flow in two circuits, one to the body and one to those increasingly important lungs. Changes to the inner ear improved detection of airborne sounds. Eyes became protected from drying out by eyelids.
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Seeds can be described as ‘a little plant in a box with its lunch’. Which parts of the seed correspond to the elements of
this description? Fill in the blank(s) with the appropriate word(s).
Chromatin condenses to form discrete, visible chromosomes
a. early in G1. b. during S. c. during telophase. d. during prophase. e. at the end of cytokinesis.
In order to meet the conditions of the Hardy-Weinberg predictions, a population must:a
mutate very quickly. b. have a high rate of natural selection. c. have a large number of immigrants. d. have extensive mating rituals. e. be very large.
Which of the following is not an advantage of uric acid excretion in terrestrial animals?
a. Uric acid can be excreted as a paste, thereby conserving water. b. Uric acid is not toxic and can be safely stored. c. Uric acid can be stored in the eggs of animals without harm to the embryos. d. Uric acid is soluble in water and can be easily excreted. e. Uric acid can be excreted along with feces in some animals.