When in life does the production of sperm begin?

This isn't a school related question but my german shepard just at a small amount of chocolate that was mixed in with peanut butter and oats what should i do?

This kind of has to do with education I'm curious: Could I be suffering from any mental illness of the emotion? I will be really happy, hear something I don't want to hear and then go ballistic.

I need an acrostic poem for respiration

Find the volume of a cylinder, diameter 12 yd height 6 yd

How can environment speed up mechanical weathering

During what time period does the balloon drift in a clockwise direction

Energy moves along a food chain when A. animals drink water from a stream. B. animals breathe air. C. plants use the Sun's energy to make food.

What organelle has vesicles migrate to the cell membrane?

Does anybody have the answers to the whole test?

In levels of orginization within an organism what is the order of these words; element, compound, organelle, cell, tissue, organ organ system