A dwarf planet is a A. small, rocky object that orbits the Sun and is usually found in a belt between the orbits of Mars and Jupiter.
B. small object made of ice and dust that orbits the Sun and forms a coma as it approaches the Sun.
C. round object that orbits the Sun but lacks the ability to clear the neighborhood around its orbit.
D. meteoroid that burns up in Earth’s atmosphere, producing a streak of light.

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.