Activation of the ________ G-protein results in the extension of lamellipodia.
Fill in the blank(s) with the appropriate word(s).
Rac
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Since 2008, grizzly bears (Ursus arctos horribilis) have been spotted farther north than their historic range. As a result, grizzly bear habitat now overlaps polar bear (Ursus maritimus) habitat. The two species of bears, which are capable of mating and producing viable offspring, are considered separate “ecological” species because historically they lived in different habitats and never met. However, in 2006 a hunter shot a wild grizzly-polar bear hybrid known as a grolar bear, the first wild hybrid ever found. This overlap is due to which of the following threats to biodiversity?
a. overharvesting b. habitat loss c. global climate change d. introduction of exotic species
In the human species, a heterozygote advantage is demonstrated by which condition?
a. hemophilia b. sickle cell anemia c. Down syndrome d. Klinefelter syndrome e. albinism
Hydroxyapatites (mineral salts), bone is half as strong as steel in resisting compression and as strong as steel in resisting tension. Lasts long after death because of mineral composition. Can reveal information about ancient people.
What will be an ideal response?
The following classes or superclasses of fish are matched with an example. Select the mismatched pair.
A. Osteichthyes-bony fish B. Placodermi-lobe-finned fish C. Myxini-hagfish D. Chondrichthyes-sharks