The oldest known and most primitive bird is the 150-million-year old Archaeopteryx. Its remains display feathered wings, but its skeleton is otherwise similar to the two-legged dinosaurs that lived at that time

Fossil record

Explanation:

The entirety of fossils, both revealed and not revealed, and their position in fossiliferous (fossil-containing) rock developments and sedimentary layers (strata) is referred to as the fossil record.

The fossil record supports the work of evolution acting as evidence. Radiometric dating methods permits geologists in estimating the numerical or “absolute” age of several strata and its fossils.

Fossils can develop under ideal situations such as preservation, permineralization, molding (casting), replacement, or compression.

The attached image shows a fossil-containing strata. For instance, Fossils is a useful tool in determining the ages of layers of rock. Sections A and B shows rock layers 200 miles (320 km) separated from each other. Their ages can be determined by estimating the fossils of each layer.

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explanation:

because i added numbers

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation: