Choose the true statement(s) about the evolutionary divergence of horses in North America. Check all that apply.
_____ Most changes are seen as adaptations for life in grassland habitats.
_____ The general trends during horse evolution are increase in body size, lengthening of limbs, reduction of digits on both sets of limbs, and tooth development for a grazing life style.
_____ Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages.
_____ Living lineages of horses show much less diversity than existed in the past.
__X__ Most changes are seen as adaptations for life in grassland habitats.
__X__ The general trends during horse evolution are increase in body size, lengthening of limbs, reduction of digits on both sets of limbs, and tooth development for a grazing life style.
_____ Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages.
__X__ Living lineages of horses show much less diversity than existed in the past.
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What process divides the nucleus of a eukaryotic cell?
a. Cytokinesis b. Mitosis c. Meiosis d. Binary fission
The plant hormone abscisic acid (ABA) is involved in the regulation of photorespiration. Based on this information, ABA likely plays a role in
A. cyclic photophosphorylation. B. the opening and closing of stomata. C. noncyclic photophosphorylation. D. the photoelectric effect.
Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?
A) Parasites have a density-dependent effect, but they do not affect host death rates. B) Parasites have a density-dependent effect, but they do not usually kill their hosts. C) Parasites have a density-independent effect, and they usually kill their hosts. D) Parasites have a density-independent effect, but they do not usually kill their hosts. E) Parasites have a density-dependent effect, and they usually kill their hosts.
Answer the following questions true (T) or false (F)
1. Watson and Crick's experiments involved isolating DNA, generating X-ray diffraction images of the DNA, and building a model of its structure. 2. The structure of DNA allows the molecule to store information. 3. Base-pairing rules apply from one DNA strand to its partner, but not along the sugar-phosphate "handrails" of a DNA strand.