Fertilization. Egg and sperm cells have just 23 chromosomes each. That's half as many chromosomes as regular cells. Through the process of fertilization, egg and sperm join to make a cell with 46 chromosomes (23 pairs), called a zygote.
Answer:
the bones that are inside your body
1). A good example for mutualism is People and plants. We provide plants Carbon dioxide. Plants provide us Oxygen
2).Biome is where you have your tundras, Rain forests, Deserts, etc. then you have to give 3 characteristics like temperature, precipitation levels, soil type, etc.
I will have to get to question 3 later since im in class but ill give you the answer to that one. its easy
B. is the answer because the nervous system send nerves down your body telling your hand to move its a reaction to the pain of the hotness your felling
Answer:
They have helical thickening of lignin in their walls to prevent collapse
Explanation:
the primary function of Xylem and its conducting vessels tracheids is to provide support and tranport water and minerals in plants.
Xylem vessels have layers of dead materials in the walls called LIGNIN. Lignin is a polymer; a very strong, hard materials that stop water passage through it,because it contains dead cells,
Therefore the presence of deposit of these strong impermeable, ligified walls in its walls prevent its collapse during mass flow of water of transpiration pull.
