Answer: The fertilized egg divides and the cells differentiate to become all of the different cell types of a human, the DNA molecules of the fertilized egg must be duplicated over and over, so that each of our trillions of cells contains an exact copy of the DNA contained in the fertilized egg.
Answer: A
Explanation: due to gravity and aliens the pollen moves upwards instead of downwards , so taht bees can better access it .
The evolutionary advantage that offered the creation of plant flowers was to attract organisms to help pollinate. It also helps to produce genetically variable seeds.
The flowers of angiosperms are specialized plant organs that attract organisms (e.g., bees) in order to help pollinate.
In angiosperms, these specialized organs (flowers) help to the pollination and thus create seeds to be spread across large land areas.
Pollination help to increase biodiversity by crossing different plants, i.e., by using the pollen from a given plant to pollinate others, thereby increasing genetic diversity.
Learn more about flowering plants here:
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Answer:
Explanation:
The chemical messengers present in the body are known as neurotransmitters. These are the chemicals that the nervous system uses to send and receive information between neurons and muscles. A neurotransmitter can have one of three effects on a neuron:
Excitatory effect, Inhibitory effect, and/or Modulatory effect.
The list of neurotransmitters and their roles are as follows:
Glutamate: This is present in amino acid compounds which are located in the synapses. It functions as an excitatory neurotransmitter, causing neurons to discharge instructions when stimulated in the central nervous system.
Adrenaline: It helps to respond to body's psychological stress and protection mechanism. They are positioned above the kidney and are created by the adrenal glands. They operate throughout the central nervous system and swiftly increase your heart rate and provide oxygen to your muscles.
Serotonin: Serotonin is a crucial brain neurotransmitter that also has a role in the small intestine. In your digestive tract, serotonin increases feelings of contentment after eating and controls your appetite. When you eat anything that doesn't agree with your stomach, serotonin assists your body in getting rid of it.
