<u>Stromatolites are layered mounds of calcium carbonate that were deposited by algae during the Precambrian time.</u>
Answer: Option C
<u>Explanation:</u>
Stromatolites are the deposit of the layer which is mostly of limestone and these are mainly formed by the blue green algae which are only one celled organism of primitive times.
The features of these are that they are normally thin and have layers that might be either light or dark in color and are either flat or some of them even have a shape of a dome.
<u>Answer:</u>
The units used to measure distances between parallels and between meridians are degrees, minutes, and seconds.
<u>Explanation:</u>
- The distance between two far-away latitudes or two far-away longitudes can be broadly measured in degrees.
- In order to pinpoint any two locations lying across two different latitudes or longitudes, the distance can be tracked down to minutes and seconds.
- The distance between two closest latitudes or two closest longitudes can only be measured in minutes and seconds because they would be placed only 59 minutes and 59 seconds apart.
<span>El Nino
</span>A change in the water temperature of the eastern Pacific Ocean that produces cooler than usual surface water temperatures. An unusually long period during which rainfall is below average. Used by NOAA to collect data to predict an El Nino<span>.</span>
Answer:
The sun, or abiotic factors
Explanation:
Primary producers are organisms that make their own food, such as plants. They do this through photosynthesis, which requires sunlight, water, and carbon dioxide.
