Structural features that serve the same function in completely unrelated organisms are said to be ________ structures
Fill in the blank(s) with correct word
analogous
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The seed plants became dominant during the late ___ when the climate became ___
a. Cambrian; wetter b. Carboniferous; drier c. Carboniferous; wetter d. Cretaceous; drier e. Cretaceous; wetter
DNA tests on remains thought to be those of Czar Nicholas Romanov II of Russia proved the remains
were his. Indicate whether the statement is true or false.
The three basic variables that make up the life history of an organism are
A) life expectancy, birth rate, and death rate. B) number of reproductive females in the population, age structure of the population, and life expectancy. C) age when reproduction begins, how often reproduction occurs, and how many offspring are produced per reproductive episode. D) how often reproduction occurs, life expectancy of females in the population, and number of offspring per reproductive episode. E) the number of reproductive females in the population, how often reproduction occurs, and death rate.
Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber? 1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex
3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 1 ? 3 ? 5 ? 4 C) 2 ? 3 ? 4 ? 1 ? 5 D) 5 ? 3 ? 2 ? 1 ? 4