Answer:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water 
Physical property is defined as the property of a substance which becomes evident during physical changes. Water is liquid at room temperature whereas hydrogen and oxygen are gases at room temperature.
Chemical property is defined as the property of a substance which becomes evident during chemical changes. Water reacts with metals to form bases, hydrogen reacts with metals to form hydrides and oxygen reacts with metals to form oxides.
Darwin reasoned that natural selection organisms had adapted to new environments, giving rise to new species. It is a principle of speciation.
<h3>Speciation, natural selection and environment</h3>
Different environmental pressures (e.g. the type of food) lead to different evolutionary pathways in genetically related organisms.
The organisms subject to different environments evolve as a consequence of natural selection in order to adapt (adjust) to their corresponding environments.
In consequence, this process may eventually lead to speciation due to the emergence of reproductive isolation barriers.
Learn more about natural selection here:
brainly.com/question/23929271
They are called paleontologists.
Answer:
People with the sickle cell mutation in both copies of the HBB gene produce proteins that clump together and lead to changes in the shape and behavior of red blood cells.
Answer:
Lipid intake through diet is important for the infants as it helps in growth, development.Brain, retina and nerve tissues contain long chain PUFA(Poly unsaturated fatty acid) that is provided through the intake of lipids.
Explanation:
Dietary lipid is traditionally be consider as an important and essential nutrient for the infants as they provide many function in the body of infants They helps for proper growth and development of the infant.Thus selection of dietary lipid is important.Brain, and other neural tissue contain long chain poly unsaturated fatty acid that are important for producing eicosanoid. They are powerful mediators as they helps in different functions that are performed by cells and tissues.More over fat provide energy that are required for doing various physiological activities.
