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.

What’s this animal (picture is tagged) and where is it most likely to live, rainforest or desert?

The influenza virus cause the flu, but not other diseases. why?

Four different thermometers were used to measure the temperature of a sample of pure boiling water. the measurements are recorded in the table below. thermometer temperature reading 1 temperature reading 2 temperature reading 3 w 100.1°c 99.9°c 96.9°c x 100.4°c 102.3°c 101.4°c y 90.0°c 95.2°c 98.6°c z 90.8°c 90.6°c 90.7°c the actual boiling point of pure water is 100.0°c. what can be concluded from the data about the reliability and validity of the thermometers?