Which of these primarily maintains ecosystem stability? A. Human Intervention
B. Positive Feeback loops
C. Global Cooperation
D. Negative feedback loops

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Why is the use of carbon-14 limited