During double fertilization, what is made when a sperm cell combines with the polar nuclei

1. the is the thinnest part of the earth. 2. the is the thickest part of the earth. 3. what metals are mentioned in the text?

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

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this