What term refers to the study of the biological systems and mechanisms?

Biophysics.

Explanation:

Biophysics is an interdisciplinary science that applies physics theories and methods to solve questions about biological systems and mechanisms. Biophysics seeks to see the living being with a body, which taking place in space and transforming energy, exists in an environment which interacts with this being. Electrical, gravitational, magnetic and even nuclear aspects are at the foundation of various biological phenomena, and therefore can be dealt with by the knowledge of the physical sciences. In short: Biophysics is the study of matter, space, energy, and time that occur in Biological Systems.

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.

myth: mosquito bites transmit hiv. & shaking hands often transmits hiv. & oral sex never transmits hiv.

fact: breastfeeding can transmit hiv. & unprotected sex transmits hiv.