Which one of the following best describes the evolutionary advantage of bipedalism?
A) allows an organism to have precise control over the action of the thumb and fingers
B) frees the hands for carrying objects
C) results in improved eye-hand coordination
D) in early humans, allowed for complex motions associated with the use of tools
E) increases the chance that an organism can communicate through the written word
B
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Sludge
A. is a byproduct of sewage treatment. B. may be a source of pollution. C. takes up space in a landfill. D. All of the choices are correct.
Which of the following is common to both meiosis and mitosis?
a. DNA replication must occur prior to these divisions. b. Homologous pairs must form. c. Cytokinesis occurs twice. d. The chromosome number does not change
It is believed that eukaryotes evolved their mitochondria from a symbiotic relationship with a free-living aerobic bacteria.
Answer the following statement true (T) or false (F)
Which term refers to the selectively permeable barrier that is present in the innermost layer of the root cortex?
a. pericycle b. root hairs c. endodermis d. quiescent centre