Which of the following is correct about the flatworm's muscular system ?
a. it's muscles are attached to a center bone.
b. it consists of two layers of muscle.
c. its muscles are all involuntary.
d. it contains three types of muscle tissue.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

d) center of the mid-ocean ridge

give brainleysest

sinserly,

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