Which of the following is a metal?
A.
calcium (Ca)
B.
iron (Fe)
C.
sodium (Na)
D.
all of these

What type of competition exsist between two species. turtles and fish

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

Which is the function of the hypothalamus in thermoregulation? answers: -sensor -effector -stimulus -intergrating center it's either a or c i believe