the diagram shows sexual reproduction. what is forming at point a?

flagella

sperm

zygote

egg

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

Bthats what im doing to and i figured it out it is b