About 12,000 years ago, climatic conditions changed, resulting in new forests, more plant food, and abundant sources of fish and other food around lakeshores, bays, and rivers. Human populations developed new techniques to catch and kill animals, and spent more time fishing and collecting wild plant foods. This new way of life marks the beginning of the Middle Stone Age, also called the:
a. Lower Paleolithic.
b. Middle Paleolithic.
c. Upper Paleolithic.
d. Mesolithic.
e. Neolithic.
d
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Examples of prosocial behavior include all of the following EXCEPT
a. assistance. b. sharing; c. caregiving. d. compassion. e. communication.
Many development projects fail because they were designed without enough knowledge of the local population
a. True b. False Indicate whether the statement is true or false
A common issue in radiocarbon dating is the "old wood problem.". This refers to
a. when old wood was scavenged and reused in a later context resulting in a date that does not reflect the time of the activity. b. the age of the plant that produced the charcoal must be determined before the radiocarbon date can be calibrated. c. only carbon samples from pieces of old wood can be used to procure an accurate date. d. that samples taken from old wood must be identified and treated with special chemicals before radiocarbon dating can be performed. e. volcanic ashes dating between 500,000 and several million years old.
________ occurs when homologous chromosomes exchange segments as a result of their extreme structural and chemical similarity.
A. Crossing over B. Replacement C. Independent assortment D. Recombination