oxygen is a substance that dissolves in water. fish absorb from the water. When dissolved oxygen levels are low, it can be hard for organisms to survive. Is this a chemical property, or a physical property. please explain

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit

We all have different forms of genes from our parent(s).what are these different forms called? a.alleles b.characters c.dna d.resources