Although freshwater biomes cover less than 1% of the Earth's surface, they are important because ________
A) we depend on them for drinking water
B) they are home to lots of species
C) they are the source of our irrigation for agriculture
D) All of the above are reasons why freshwater biomes are important.
D
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Genes that are highly conserved are
A) found in a wide range of species. B) repeated many times in a genome. C) found in humans only. D) deleted by natural selection.
Following cleavage of the zygote, which of the following is the first to occur?
a. blastula b. gastrula c. neural crest d. morula e. primitive streak
What is the term used to describe relatively small areas with unusually high concentrations of species found there and nowhere else, including many species in high risk of extinction? These areas receive the focus of global conservation efforts
A) Natural wildlife reserve B) Biodiversity hot spot C) Protective wilderness refuge D) Protective conservation zone
Why are fossils from older species found deeper in the ground than those from more recent species?