If a plant with purple petals (pp) is crossed with a plant with white petals (pp), what is the phenotype for the f1 generation?

The correct answer is-

The phenotype ( physical appearance) for the F1 generation is Purple petals.

As per the information in the question, the genotypes of parent plants are-

PP ( showing purple petals) and pp ( showing white petals).

This indicates that purple petals is a dominant trait ( expressed by capital letter allele).

White petal is a recessive trait (expressed by small letter allele)

A dominant trait masks the expression of recessive trait. Purple petal can have two genotypes that is Pp ( heterozygous dominant) and PP ( homozygous dominant) whereas white petal will exhibit only in the genotype pp ( homozygous recessive).

When these two parents are crossed, they will produce all plants with purple petal ( genotype Pp) in F1 generation.  

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

b is the correct answer