Good coronary circulation nourishes the heart and reduces the risk of a heart attack. Coronary arteries supply blood to the myocardium and other components of the heart. They originate from the left side of the heart at the base of the aorta. The heart muscles needs oxygen-rich blood to be able to carry out its functions.
The placenta provides oxygen to the baby and excretes carbon dioxide into your bloodstream.
meaning that the baby does not simply absorb oxygen from a women's bloodstream. blood and gas transports occur through the placenta, also the placenta delivers oxygen-rich blood through the umbilical vein not artery
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b. Natural selection is an example of the major mechanism by which evolution occurs
Explanation:
The concept of evolution are both closely related in that natural selection is the major mechanism by which evolution occurs. This was proposed by Charles Darwin after his journey to the Galapagos Island on the HMS Beagle.
- Evolution is the change in the characteristics of an organism over several generations.
- Organisms evolved to in order to be at an advantage and naturally favored.
- According to Charles Darwin, organisms evolved by the process of natural selection.
- Natural selection is the process by which an organism becomes adapted to its environment.
- Organisms with desirable trait are naturally favored with competitive and reproductive advantage in the environment.
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Evolution brainly.com/question/6912833
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Answer:
The geologic time scale is the calendar for events in Earth history. It subdivides all time into named units of abstract time called escending order of duration eons, eras, periods, epochs, and ages.
