When a pregnant woman ingests toxins such as alcohol and nicotine, the embryo is put at risk because these toxins can
A. diffuse from the mother's blood into the embryo's blood within the placenta
B. enter the embryo when it eats
C. transfer to the embryo since the mother's blood normally mixes with the embryo's blood in the placenta
D. enter the uterus through the mother's navel
Answer: A. diffuse from the mother's blood into the embryo's blood within the placenta
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Some plants are able to endure frequent flooding events because they contain a tissue with loose parenchyma cells and large air spaces called
A. xylem. B. spongy mesophyll. C. pneumatophores. D. aerenchyma. E. epidermal tissue.
Clasp your hands together (without thinking about it). Which thumb is on top every time you do this? The dominant phenotype is left thumb on top. If you have the genotype tt, which thumb is on top?
A. left B. left 50% of the time and right 50% of the time C. left 25% of the time and right 75% of the time D. right E. left 75% of the time and right 25% of the time
The scientific name for coffee is Coffea arabica. From this information you know that the species
name is arabica. __________________ Indicate whether the statement is true or false.
What is an ADVANTAGE of asexual reproduction?
A.) it produces genetically identical organisms B.) there is no genetic variation C.) reproduction can occur quickly D.) organisms cannot grow very large