Answer the following question given this paragraph: 

One trait invertebrates like the sponge and tarantula share is lack of a backbone. In fact, they don’t have any bones at all. These are defining traits of all invertebrates. Some invertebrates have a skeleton, but it isn’t made of bone. Many other traits of invertebrates show considerable diversity.


Q: What traits do the sponge and tarantula share?

 Choices:

- number of eyes

- number of legs

- lifespan

- lack of backbone

A:
lack of backbone
