In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a
heterozygous black cocker spaniel is crossed with a brown
cocker spaniel, what fraction of their offspring would be expected
to have a brown coat?

Sydney drew a flow chart to illustrate the nitrogen cycle. which labels best complete the flow chart? x: producers undergo photosynthesis. y: nitrogen compounds are released into the air. x: nitrogen compounds are released into the air. y: producers undergo photosynthesis. x: free nitrogen is in the atmosphere. y: producers absorb nitrogen compounds through their roots. x: producers absorb nitrogen compounds through their roots. y: free nitrogen is in the atmosphere.

Which of the following best describes the relationship between glucose and complex molecules such as hormones?

Explain how scientists use geologic time to determine the age of landforms.