2. what is an investigation? what is a demonstration? how are the different?

When organisms are classified ,they are given a two part name

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

What is used to keep track of the gamates and possible offsprings combination