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i think its this one c. They indicate the sex of an individual.
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This means that the two separate rocks were once part of one piece of rock. These layers got separated most probably by continental drift as a result of tectonic plate movements. An example of such a fossil is the Mesosaurus, a freshwater crocodile-like reptile, that is found in Southern Africa and Eastern South America continents- that means they were once one land mass.
The environment in these two separate layers would most likely be different. As the layers drift apart from each other , they drift across latitudes that are determinants of climate in a region. Therefore, even the organisms in these two rock layers will evolve differently (even though they will share a common ancestor) in adaptation to respective environments – this is called allopatric speciation.
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When cells work together to perform a specific function, that group of cells is called a tissue. Cartilage is a type of connective tissue made from many cells. Other types of tissues in your body include your muscles and skin. Complex multicell organisms have many different types of tissues, all comprising two or more types of cells.
Ground my dude! wanna know how I know! I checked the other answers on the other one :)
