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.
Answer:
Equation
Explanation:
the last word is Equation
The hypothalamus synthesizes and secretes certain hormones called releasing hormones which stimulate the secretion of pituitary hormones.
The hypothalamus gland uses the nervous system and secretes hormones which sends messages to the pituitary hormones.
Answer:
Unsaturated fats are foods from plants, such as vegetable oil, nuts, and seeds.
Explanation:
In naming a few dietary sources of unstaurated fats include:
- avocados and avocado oil
- olives and olive oil
- peanut butter/peanut oil
- fatty fish such as salmon and mackerel
- nuts and seeds, such as almonds, peanuts, cashews,
