Which gas did volcanoes not produce in the Precambrian era?

A. Oxygen

B. Carbon dioxde

C. Sulfur

D. Water vapor

Does the distance between the sun and earth have any bearing on the seasons?

How are predation and parasitism similar? How are they different?

Which statement correctly correctly describes the mechanism of inheritance? A.) Alleles from heterozygous chromosomes determine traits. B.) Chromosomes on homozygous genes determine traits. C.) Alleles on homologous chromosomes determine traits. D.

What is the meaning of matter

What will most likely increase the amount of erosion that occurs on the banks of the river?

What must happen before the cell can go through mitosis? Interphase.

Belle's grandfather lives in a region where the temperature drops below 0*F at night. When belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rock had cracks in them.

The genetic condition of an organism that has two identical alleles for a given trait.

Which level of biological classification is the lowest level that butterflies

What might happen if a continent stops rifting apart?