each annual ring or growth ring consists of two strips of

Options

A. autumn wood and spring wood
B. heart wood sap wood
C. xylem and phloem
D. cork and cortex

Answer

To answer the question "each annual ring or growth ring consists of two strips of," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Annual Rings**:
- Annual rings, also known as growth rings, are layers of wood produced during one growing season of a tree. Each ring corresponds to a year of growth.

2. **Identifying Components of Annual Rings**:
- Each annual ring is made up of two distinct types of wood: one formed in the spring and one formed in the autumn.

3. **Spring Wood**:
- The wood that forms in the spring is known as **spring wood**. This wood is typically lighter in color and is produced during the early part of the growing season when conditions are favorable for growth.

4. **Autumn Wood**:
- The wood that forms in the autumn is known as **autumn wood**. This wood is darker and is produced during the latter part of the growing season when growth slows down as conditions become less favorable.

5. **Conclusion**:
- Therefore, each annual ring or growth ring consists of two strips: **autumn wood and spring wood**.

### Final Answer:
Each annual ring or growth ring consists of two strips of **autumn wood and spring wood**.

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