Why might increases in atmospheric carbon dioxide caused by human activities threaten livimg organisms?

Describe how alleles and genes are related

You see a white marker with an orange circle and black lettering. what does this marker tell you

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed