I wouldnt say that it has much to do with latitiude eventbkigh there are quite a few at both of the poles. It usually corresponds wirh altitude. There are glaciers in every continent.
Polyploidy (more than two complete sets of chromosomes) is not rare among plants. For example, pollen grains may reach female flowers via animals or wind. In some cases, pollen grains from species with 4 complete sets of chromosomes will have 2 sets of chromosomes. Pollen grains may fuse with a female reproductive organ with 1 set of chromosome (so, female plant must have 2 sets of chromosomes). The resulting zygote will have 2 + 1 sets of chromosomes, so the plant will have 3 complete sets of chromosomes.
Answer: Fish are farmed by breeding them in controlled environments. Kennels sort of. They are huge cages in man-made resivours with temperature and water control. Once they have grown to be a certain size they are extracted and killed for their meat while the eggs are used to produce another batch of fish. Hope this was helpful :).
Answer:
Early land animals had both lungs AND gills, and their bodies consisted of few hard parts. Meaning they lacked things like an exoskeleton for instance. Animals today have either lungs OR gills and many have protecting hard parts of their bodies.
Explanation:
Functional and economically most important mineral in nutrition of layers
is calcium, primary because of egg production, i.e. forming of the egg shell.
