B, C, D, B
I hope these are right, hope this helped.
Circulatory system.....circulates blood (a vital delivery system of oxygen) throughout the whole body when tissues need it the most and with a constant supply.
Corpus Callosum is a band of thick fibres which connects the hemispheres of the brain.
Before - question, research, hypothesis, experiment, conclusions
Gametes are the genetically different kind of cells which are produced as a result of meiosis. Meiosis is a reductional division in which the chromosomes are reduced to half. Genetic variation in the gametes is due to crossing over between two non-sister chromatids of a homologous chromosomes during meiosis.
