Either C or D. I think C, but I'm not too sure...
Answer:sponge is one answer.
Explanation:
When the telomere becomes too short, the chromosome reaches a 'critical length' and can no longer be replicated.
Most animals in Animalia have backbones, but not all.
The correct answer would be C, because all organisms in Animalia are heterotrophs which means that they depend on other organisms (like animals and plants) for food.
