John Dalton's theory states that atoms cannot be destroyed.
Answer:
Food and water go down the same tube which is called the esophagus.
Estrogen
Estrogen is the primary “female” hormone. It is involved in many of the physical and emotional changes seen in transition. Estrogen may be given as a pill, by injection, or by a number of skin preparations such as a gel, spray, or a patch. Pills are convenient, cheap and effective, but are less safe if you smoke or are older than 35
Answer:
The Earth is 4.6 Billion years old.
QUESTION 2:
Option A is the correct answer.
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Answer:
during external respiration
Explanation:
Oxyhemoglobin is a type of hemoglobin carrying oxygen which is bright red in color. In the blood, it's major function is to carry oxygen molecules throughout the body.
Oxyhemoglobin is formed during external respiration. External respiration also known as breathing occurs in the lung. During external respiration, there is an exchange of oxygen and carbon-dioxide between the cells of the body and blood vessels. During breathing, oxygen diffuses into the blood, the oxygen then binds with heme in the hemoglobin found in erythrocytes to form oxyhemoglobin.
