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6
Select the correct answer from each drop-down menu.
An element has an atomic mass number of 16 and an atomic number of 7.
The element has
protons and
v neutrons.

What is the main fuel source for the work of the cell

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

Which muscle cell structure stores calcium ions that are used to trigger the contraction?