One population, called hematopoietic stem cells, forms all the types of blood cells in the body. A second population, called bone marrow stromal stem cells (also called mesenchymal stem cells, or skeletal stem cells by some), were discovered a few years later. BAMMMM!!!
Answer:
Prophase
Explanation:
DNA is condensed and pairs of homologous chromosomes exchange sections of DNA.
ANSWER: The daylight and nighttime hours are equal.
Explanation: resulting in a "nearly" equal amount of daylight and darkness at all latitudes. These events are referred to as Equinoxes. The word equinox is derived from two Latin words - aequus (equal) and nox (night).
The number of protons in an atoms nucleus is called the atomic number.
<span>The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf. Water enters the root and is transported up to the leaves through specialized plant cells known as xylem vessels.</span>