Answer:
C. Bilateral symmetry
Explanation:
Just before the Cambrian explosion, approximately 600million years ago, multicellular aquatic animals are thought to have developed new body plans. As a result they split into two groups of organisms which were notably radially symmetrical and bilaterally symmetrical. These early bilaterally symmetrical animals were simple organisms without a body cavity called a coelom; further evolution, led to the development of complex coelomates. Eventually, land-dwellers capable of respiring out of water with the aid of lungs emerged, and subsequently, their adaptations allowed for reproduction in their new habitats.
In meiosis II! Anaphase II, specifically.
Remember that the prefix Ana- means back, so you can remember that the sister chromatids are pulled back away from each other; thus, they are separated.
To view three-dimensional objects and larger specimens, with a maximum magnification of 100x
Answer:
hydrophilic and face outward toward the aqueous solution on both sides of the membrane
Explanation:
The cell membrane is mainly composed of phospholipids, which are arranged in a lipid bilayer. In general, phospholipids consist of a glycerol unit, a phosphate group, and two fatty acids. In a lipid bilayer, hydrophilic (polar) phosphate heads are always oriented outwards and interact with surrounding water molecules; whereas hydrophobic fatty acid tails are oriented towards the center of the lipid bilayer away from water. It is for that reason that phospholipids are considered to be amphipathic molecules, where fatty acids confer hydrophobic properties and polar phosphate groups confer hydrophilic properties.
Answer:
A: Natural selection would likely have selected for humans with little skin pigmentation
Explanation:
Sunlight/UV radiation has been discovered to be an inducer of immediate pigment darkening or melanin production. Hence, if a sunlight/UV radiation shield is is constructed to limit the amount of radiation that reaches the earth, after a while, this might become a selection factor.
Natural selection would likely have selected for humans with little skin pigmentation, those that are able to successfully adapt to the effects of limited sunlight/uv radiation. Humans who are not able to adapt to limited sunlight/uv radiation eventually get replaced in the population by those that are well adapted.
<em>According to theory of natural selection which was proposed by Darwin,</em> organisms with heritable traits that enable them to adapt to changes in an environment will survive more and produce offspring which are also able to survive. This eventually leads to eventual dominance of well adapted organisms in the environment over those that are not able to or weakly adapted.
<em>The correct option is A</em>
