A persian cat shows both the traits for orange fur and black fur. What kind of allele expression is this?.

All of the following are examples of service-learning opportunities except: a. donating time to senior citizen war veterans and writing a report about the experience for your u. s. history class. b. getting a part-time job at a habitat restoration center. c. reading to second-grade students as part of your assigned reading time for your english class. d. planting trees in your community and then discussing global warming in your science class.

Which is an advantage to using nonrenewable resources? a. they can be cheaper. b. they can have a lower impact on the environment. c. they can be used up rapidly. d. they can contribute to global warming.

Did the universe cool off or get hotter as it expanded after the 'big bang"?