As a child, you may have dug in the dirt and played around with
Platyhelminthes: flatworms
Nematode: roundworms
Annelida: segmented worms
Mollusca: mollusks

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13

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

Conservationists to restore ecosystems. which activity will positively affect the abiotic conditions of an ecosystem?