I believe the correct answer from the choices listed above is option A. In this experiment, sunlight is an independent variable. It is the variable that cannot be changed James no matter what. Hope this answers the question. Have a nice day.
<u>Answer:</u>
Geologists have sorted earth’s history into different geologic time scale. They just clubbed it into time scales by observing the major changes in the life forms that existed on the earth. Inferring to the fossils found in rocks the time scale was calculated.
First era single cell animals were formed then formed the complex animals.Then Mesozoic era where it is known as the era of dinosaurs. Then the evolution of different species of life during Cenozoic era. These major changes found through fossils helped them to form the GTS.
It's the way in which two identical cells can be made from an original.
The charge of the electrical impulses sent from stimuli is extremely positive. Thus, the correct option is A. The net charge of such electrical impulses is positive because of the positively charged ions of the Na+.
<h3>What is an electrical impulse?</h3>
An electrical impulse may be defined as a nerve impulse that contains an electrical signal which travels throughout the body by the axon terminal.
In the resting potential state, the potential difference is -80mV, while after reaching the electrical impulse it changes to +40mV. This happens due to an electrical imbalance between sodium and potassium influx and efflux.
Therefore, the correct option is A.
To learn more about Electrical impulses, refer to the link:
brainly.com/question/840056
#SPJ1
Answer:
Lupus erythematosus is a type of autoimmune disease in which own important healthy cells are attacked by our body.
Explanation:
The systems that are affected by Lupus erythematosus include the following -
- Joints
- Skin
- Kidneys
- Blood cell
- Brain
- Heart
The most common signs and symptoms of Lupus erythematosus include:
-
Fatigue
- Fever
- Dry eyes
- Chest Pain
- Joint pain, stiffness and swelling
- Butterfly-shaped rash on the face
- Photosensitive Skin lesions
- Fingers and toes that turn white or blue when exposed to cold or during stressful periods (Raynaud's phenomenon)
- Shortness of breath
- Headaches, confusion and memory loss