In 1898 friedrich loeffler and paul frosch found evidence that the cause of a highly contagious hoof and mouth disease in livestock was a microscopic infectious particle it was discovered that this particle requires a host cell to reproduce

The image shows embryos of three vertebrate classes

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.

What are the student's observations and inferences before he starts his investigation?