Recessive alleles seem to vanish in some generations and reappear in later generations because: a. They cannot be expressed in males

b. They are masked by a dominant allele

c. They cannot be expressed in females

d. They cannot be expressed in successive generations

e. They are lost by mutation

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rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements