Which of the following best expresses the definition of an open system? a. energy can enter or leave the system but matter cannot. b. heat and matter are both able to enter or leave the system. c. matter can enter or leave the system but energy cannot. d. heat and matter can enter the system but cannot leave the system..

Recessive disorder or disease - how would a child get it?

Asap 1. which surface feature of the moon is characterized by mountainous areas? question options: maria terrae regolith craters 2.which statement describes surface features called maria on the moon? question options: layers of dust and rock deep areas of cooled lava deep, rocky and barren valleys highlands and mountainous areas

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude