They were like rain gutters or spouts
Idk if you need a translation for it, but it’s:
Make a synoptic chart explaining the classification (that is, the types) of skeletal muscle (according to its histological characteristics, according to its shape, according to the number of bellies, according to the number of insertions, according to its action, according to its action in group), also mention the characteristics of each type and some examples.
The answer is 77 years old, since the sisters are 3 years apart.