Which statement about metamorphic and sedimentary rocks is true?

a both types of rocks form under high temperature, but sedimentary rocks also require high heat.
b only metamorphic rocks show signs of rock layers.
c both types of rocks form under high pressure, but metamorphic rocks also require high heat.
d both types of rocks result from the cooling of magma.
e either type of rock can be classified as intrusive or extrusive.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

Why are current extinctions of concern to enviromentalists?

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!