If a TT and tt allele make Tt, what does a Tt and tt allele make?

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

If assuming tasting ptc as a simple gene trait,what other genotype would you select to put in this missing genotype box that could result in this phenotype

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.