The answer is genetic factors, chromosomes, meiosis.
W.S. Sutton proposed that the <u>genetic factors</u> are located on <u>chromosomes </u>and these factors segregate during <u>meiosis </u>and the production of gametes.
Genetic factors are now known as genes, which are sequences on chromosomes. They code for proteins. Meiosis is a cell division resulting in the reduction of number of chromosomes in gametes.
Tundra ecosystem is cold and sunlight is short. Plants need sunglight and warmth in order to grow, thus plants in tundra are shorter and cloers to the ground since the ground is warmer than the air
5: the parasite and the host need each other
They form when continents collide; this boundary is a convergent / collision