Answer:
Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. ... The oxygen that is now in the Earth's atmosphere was not there at the beginning.
Explanation:
The muscles of our lungs, stomach, and intestines are made of smooth muscle tissue. There are three types of tissue. Skeletal, cardiac and smooth.
They both contain DNA but in prokaryotic cells, the DNA isn't in a membrane-enclosed nucleus but is found floating in the cytoplasm. They both also have cell walls
Answer:
The body regulates those levels in an example of homeostasis. When levels decrease, the parathyroid releases hormones. If calcium levels become too high, the thyroid helps out by fixing calcium in the bones and lowering blood calcium levels. The nervous system helps keep homeostasis in breathing patterns.
Explanation:
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Answer:
All living things in the picture. Crab, Fish, Algea and grass. A characteristic that makes a goldfish a living thing is that it grows and develops.
