Question

what is cancellous tissue?
sponge - like tissue inside of bones
smooth tissue at the end of bone
hard outer tissue

Explanation:

Cancellous (spongy) bone tissue is a porous, lightweight type of bone found inside the hard outer cortical bone, matching the first description. The other options refer to articular cartilage (smooth end of bone) and compact bone (hard outer tissue).

Answer:

sponge-like tissue inside of bones