When a pregnant woman ingests toxins such as alcohol and nicotine, the embryo is put at risk because these toxins can

1) diffuse from the mother's blood into the embryo's

blood within the placenta

2) enter the embryo when it eats

3) transfer to the embryo since the mother's blood

normally mixes with the embryo's blood m the placenta

4) enter the uterus through the mother's navel

the median of the data is 4.5.

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.