A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms
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:
the engineering of rice crops to withstand flooding and contain more nutrients
Explanation:
hope this helps
Answer:
**All are Correct**
Explanation:
The elbow is made up of the humeroulnar, humeroradial and proximal radioulnar joints ✔
The elbow flexors are stronger than extensors✔
The MCL is taut during distraction at 90 degrees of elbow flexion✔
The joint capsule resists extension from neutral into hyperextension✔
Answer:
1 they don't eat plant, they eat plankton
2 they are mammals
3 they have blowhole like other aquatic mammals
