Answer:
A. 3
B. 4
C. 5
D. 6
E. 2
F. 1
Explanation:
1. Integumentary system.
This is an organ system that consists of hair, skin, nails and exocrine glands with receptors that senses the outer stimulus and environmental conditions, through homeostasis maintain stability of the internal environment.
2. Nervous system.
It receives sensory information and signals, convert them to nerve impulses that are transmitted to the body and brain via the spinal cord using nuerons and axons. It also intergrates, retains and analyses information in the brain.
3.Endocrine system.
Secretes hormones and chemicals in response to stimulus from the nervous system to maintain balance using feedback loops i.e, negative and positive.
4. Lymphatic system.
Part of the immune system that consist of vessels that carries lymph, cleaning the blood by filtering lymph with foreign particles into the lymph node.
5. Urinary system.
Used to eliminate waste from the body, regulates blood pressure, volume and pH. It also used to retain electrolytes and metabolites.
6. Respiratory system.
Used for gaseous exchange using the blood, heart and lungs. Air enters the lungs, transported by blood and is pumped by the heart to all body parts where oxygen is dropped, carbon dioxide is collected by the veins to the lungs and released to the atmosphere.
Answer:
Female mosquitoes feed on the blood of animals
Explanation:
Answer:
Explanation:
Waves affect the ocean by creating disturbances that move energy through the water.
As the wind blows on the surface of the ocean, waves are created that transmit energy through the water from a starting point to an end point.
The chemical process is called precipitation.
Usually, a combination of salt and ethanol are added to a solution in order to allow the DNA to precipitate or come out of solution.
Polar molecules are those with uneven distribution of charges in their structure, which gives them partial positive and partial negative parts in their structure. In general, the rule in solubility is "like dissolves like," which means that polar or charged solutes can dissolve in a polar solvent. Ionic and polar solutes which are "attracted" to and dissolve in water are called "hydrophilic" (water-loving), while nonpolar solutes, which do not dissolve in water are called "hydrophobic" (water-fearing or hating).
DNA has a sugar-phosphate backbone in its structure. The phosphate (PO3-) groups of the backbone are negatively charged. Water, being a polar molecule (with the oxygen end being more negatively charged, and the hydrogen ends being more positive), can interact with the negatively-charged phosphate groups of the DNA and allow the DNA to dissolve in water.
When salt (usually sodium acetate) is added, the positive ions of the salt (e.g. Na+ for sodium acetate) interact with the negatively-charged ends of the phosphate groups (PO3-) in the sugar backbone. This "neutralizes" the charges of the negatively-charged phosphate groups. As a result, the amount of water molecules able to interact with the phosphate groups diminishes, and this lessens the solubility of the DNA.
However, because water has a relatively high dielectric constant (index of polarity), it would be fairly difficult for the Na+ ions to interact with the PO3- groups. Adding the ethanol, which has a lower dielectric constant than water, makes it easier for the Na+ ions to come together with the PO3- groups, and shields it charge from the water molecules. This makes the DNA molecules less hydrophilic and less soluble. As a result, the DNA molecules come out of solution (through a process called precipitation).
The answer ➪ Prior to pupae formation, the large maggots move away from the body, sometimes into the soil.
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