A : In anthrax, the animal dies due to lack of oxygen
R : The anthrax bacterium uses up the oxygen carried by the animal blood

Answer

### Step-by-Step Text Solution:

1. **Understanding Anthrax**:
- Anthrax is an infectious disease caused by a bacterium known as *Bacillus anthracis*, which is a gram-positive, rod-shaped bacterium.

2. **Life Cycle of the Bacterium**:
- The bacterium produces dormant spores that can survive in the environment, such as in soil and grass. These spores are inactive until they enter a suitable host.

3. **Infection Process**:
- When an animal, such as cattle, grazes on grass contaminated with these spores, the spores enter the animal's body. Once inside, they become active and multiply.

4. **Toxin Production**:
- As the *Bacillus anthracis* bacteria multiply in the bloodstream, they produce various toxins, including lethal toxins that can have severe effects on the host.

5. **Impact on Oxygen Levels**:
- The toxins produced by the bacteria can infect the lymph nodes, particularly in the chest area, leading to fluid accumulation (edema) in the chest cavity. This accumulation causes difficulty in breathing.

6. **Resulting Hypoxia**:
- Due to the edema and the bacteria's consumption of oxygen in the blood, the animal experiences a lack of oxygen (hypoxia), which can ultimately lead to death.

7. **Conclusion**:
- Therefore, the statement that "in anthrax, the animal dies due to lack of oxygen" is true, and the reason is that "the anthrax bacterium uses up the oxygen carried by the animal blood."