Which statement logically predicts how natural selection, when acting on genetic variation, may subsequently result in evolutionary adaptation?
A) As global warming continues, many species found near the tropics will migrate either northward or southward toward the poles.
B) During years of drought, tree rings will be narrower.
C) As the African environment becomes drier and the grasslands more prevalent, arched feet and non-opposable toes, both more effective for walking upright, became more common in hominins.
D) Insect diversity in temperate broadleaf forests will vary from year to year based on the amount of precipitation.
Answer: C
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What structures in an animal's body would be the primary targets of genes for behavior? Check all that apply.
_____ brain _____ kidneys _____ muscles _____ neurons _____ lungs
What stimulates muscle contractions during labor?
a. HCG b. estrogen c. signals from vagina d. oxytocin e. gonadotropins
Plate tectonic theory is based on ____
a. a model in which cool material in the earth's crust rises and spreads laterally beneath the crustal plates b. the idea that Earth's crust is fragmented into rigid crusts that are sinking slowly beneath crustal plates c. the idea that sedimentary rock formation causes continents to drift apart slowly on their crustal plates d. observations that the sea floor is slowly spreading away from oceanic ridges, driven by plumes of magma welling up from Earth's interior e. evidence that severe disturbances in Earth’s crust shaped the continents in a single large event
James Watson and Francis Crick
a. established the double-stranded nature of DNA. b. established the principle of base pairing. c. explained how DNA's structure permitted it to be replicated. d. proposed the concept of the single-helix. e. discovered genes.