At the end of the Permian period a large mass extinction occurred; 90-95% of the marine and terrestrial species were eliminated. Which of the following are thought to be the possible cause(s) of this mass extinction?
A. Glaciation.
B. Meteorites colliding with the Earth.
C. Volcanic eruptions.
D. Competition between marine and terrestrial animals.
E. Glaciation or volcanic eruptions.
E. Glaciation or volcanic eruptions.
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The human skeleton is a typical vertebrate
A. exoskeleton. B. hydrostatic skeleton. C. axial skeleton only. D. endoskeleton. E. appendicular skeleton only.
Which of the following is a characteristic of K-selected species?
a. Adapting to stable environments b. Having a high number of offspring c. Offering minimal parental care d. Providing no resources to their offspring
Which is the correct sequence for the evolution of reptilian features?
A. notochord, jaws, vertebrae, bony skeleton, lungs, 4 limbs and an amniotic egg B. vertebrae, jaws, notochord, bony skeleton, lungs, 4 limbs and an amniotic egg C. notochord, vertebrae, jaws, 4 limbs, bony skeleton, lungs, and an amniotic egg D. notochord, vertebrae, jaws, bony skeleton, lungs, 4 limbs and an amniotic egg E. notochord, vertebrae, jaws, cartilaginous skeleton, lungs, 4 limbs and an amniotic egg
The stage of cellular reproduction in which nuclear division occurs; process in which a parent nucleus produces two daughter nuclei, each having the same number and kinds of chromosomes as the parent nucleus.
What will be an ideal response?