Life on Earth has experienced several mass extinctions. What likely caused one or more of these extinctions?
A) an asteroid impact
B) worldwide drought
C) genetic drift
D) an increase in large predatory mammals
A
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In the lab, you choose to design a simple experiment to distinguish between hydrophilic and hydrophobic substances. You start by adding equal amounts of vinegar and oil to a container. After shaking, the vinegar and oil levels separate, based upon polarity and density. To this you add glucose and sodium citrate and shake again. Where do you expect to find the glucose and sodium citrate in
greatest quantities? A) Both will concentrate in the oil layer. B) The glucose will concentrate in the vinegar, sodium citrate in the oil. C) Both will concentrate in the vinegar layer. D) Sodium citrate will concentrate in the vinegar, glucose in the oil. E) Both will be uniform throughout both layers.
Atoms share electrons unequally in a(n)_____ bond
Fill in the blank(s) with correct word
What pigments are present in the samples derived from individuals that are homozygous recessive for shell color?
a. Red and grey b. Yellow and grey c. Red and yellow d. Red, yellow, and grey
Vertical evolution arises fromSelect all that apply.
A. interspecies exchange of genes. B. gene duplication. C. bacterial conjugation. D. genetic mutations. E. sexual reproduction.