If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis?
<span>I have a graph with the vertical axis showing the percentage of radioactive element remaining. </span>
Answer:
its number 1
Explanation:
because the fly is stuck in amber
and the snail shell is in mold and is filled up
and number 2 is not cast
Answer:
urinary bladder does not help in reproduction
<span>C. heart, blood and blood vessels.</span>
The cardiovascular system is also known as the circulatory system.It is made up of the heart, the blood vessels namely arteries, veins and capillaries, and approximately five liters of blood.The circulatory system's major functions are to transport oxygen, hormones, and nutrients to every cell in the body, and to tale away cellular waste products from the cells such as carbon dioxide and bring them to excretory organs where they are expelled out of the body.
