Answer:
Reciprocal altruism is one of the altruism behaviors in which an individual organism helps in increasing the fitness of another organism by reducing the fitness of itself temporarily in expectation of the same behavior from another organism in the future later.
It takes place in the same set of organism partners which is a continuous interaction ion in stable groups of organisms.
Thus, the correct answer would be - an ongoing interaction in the same set of partners.
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.
The leaves grow when the plant is growing.and the leaves are attached because it's part of the plant
<span>A. The elevated vertical board from which the hoop projects ---------- 9. Backboard
B. The most basic shot in basketball; uses the backboard ------------- 6. Lay-up
C. A pass used to cover very long distances ------------------ 5. Overhead pass
D. A pass used for very long distances, but with higher velocity ----- 7. Baseball pass
E. Either of the two goals in basketball --------------10. Basket
F. A common pass that utilizes the floor --------------- 4. Bouncing pass
G. A common pass aimed at the torso of another player ------ 2. Chest pass
H. Term for dribbling the ball from the front to the back of the body --- 3. The spider
I. Repeatedly bouncing the ball on the floor ------- 1. Dribbling
J. A common shot usually taken 5 to 50 feet away from the basket ------ 8. Jump shot</span>
