Asexually reproducing animal populations are rare, but they typically consist of females who produce female offspring, so all of
fspring can produce more offspring. By contrast, half of the offspring of the sexual reproducers are male and cannot produce offspring. Thus, a clonal population of females can expand much more quickly than a population of sexual reproducers. Potamopyrgus antipodarum is a species of freshwater snail that has spread far beyond its native New Zealand. Some populations of these tiny snails reproduce sexually, and other populations reproduce asexually. Huge asexual populations are now disrupting ecosystems all over the world, particularly where the water is contaminated with phosphorus. Fertilizers and detergents contain phosphorus, so agricultural runoff and other forms of water pollution are common in these regions. Like most animals that cannot reproduce sexually, the asexual snails have at least three sets of chromosomes; like most sexual organisms, the sexual snails have two. Explain why sexually reproducing snail populations predominate in regions where the water is unpolluted.
B. sheet of connective tissue that attaches a muscle to another muscle or bone.
Explanation:
The aponeurosis are mainly made of collagen fibers and works as an insertion to some skeletal muscles. The aponeurosis fibers can connects muscles to the bone or with another muscles connecting the aponeurosis fibers among themselves.
Inorganic fertilizers are not entirely composed of the nutrients needed by the plants. It also contains salts and other compounds. These are not absorbed by the plants so they are left behind in the soil and build up over time.
The Northern Hemisphere refers to the half of the planet that is north of the equator, while the Southern Hemisphere is all of the planet south of the equator. ... The North Pole, of course, is in the Northern Hemisphere, while the South Pole is at the most southerly part of the Southern Hemisphere.Apr 2
