Muscles,tendons,ligaments,and cartilage
what? I think you're missing some crucial information in this question.
<span>Light energy has to be converted into chemical energy in ATP molecules. Plants change light into sugar molecules and both plants and animals change sugar into ATP molecules, which allows for our survival</span>
Answer
Just think critically about why (if you were an egg laying species), having a fetus/baby develop inside of you would be advantageous.
For one, eggs are much less protected from outside factors such as predators, temperature, etc than live birthed creatures. Live birth provides protection inside the mothers body from things such as heat, cold, moisture, predatory animals, etc. An egg laying animal must keep its eggs at a perfect temperature and check to make sure no other animal has eaten them.
