What is the goal of correlation? Correlation can help geologists identify and match widely separated strata.

The idea that the laws that govern geologic processes have not changed during Earth’s history was first expressed by Scottish geologist James Hutton, who in 1785 presented his ideas—later published in two volumes as Theory of the Earth (1795)—at meetings of the Royal Society of Edinburgh.

What is the significance of an unconformity? represents an interval of time that is missing from the rock record.

The Correlational Research Strategy. The goal of correlational research is to describe the relationship between variables and to measure the strength of the relationship. A correlation describes three characteristics of a relationship. The direction (positive / negative)of the relationship.

Two conditions that favor the preservation of an organism as a fossil are RAPID BURIAL and HARD PARTS.

The word “tetrapod” means “four feet” and includes all species alive today that have four feet — but this group also includes many animals that don’t have four feet. And birds and humans are tetrapods even though they only walk on two legs.

Tetrapods include all those animals with four limbs. Humans are tetrapods, as are dogs and dinosaurs and salamanders.

The Four-Legged Vertebrates Amphibians, reptiles (including dinosaurs and birds) and mammals are the major groups of the Tetrapoda.

The common ancestor of the lobe- and ray-finned fishes had lungs as well as gills. Coelacanths and lungfish also retained their gills. Modern tetrapods, on the other hand, bear evidence indicating that we once had gills but that these were lost in the course of our early evolution.

As said above, tetrapods are designed to protect the coast from wave action/erosion and to reinforce coastal structures such as seawalls and breakwaters..

Not extinct

Gills were present in the earliest fish, but lungs also evolved pretty early on, potentially from the tissue sac that surrounds the gills. Swim bladders evolved soon after lungs, and are thought to have evolved from lung tissue.

Amniotes are a clade of tetrapod vertebrates comprising the reptiles, birds, and mammals. Amniotes are characterized by having an egg equipped with an amnion, an adaptation to lay eggs on land or retain the fertilized egg within the mother.

Sharks and whales both have streamlined bodies and tail flukes. Hint: Whales are tetrapods.

Tetrapods (Greek tetrapoda, Latin quadruped, “four-legged”) are vertebrate animals having four feet, legs or leglike appendages. Amphibians, lizards, crocodiles, dinosaurs, birds, and mammals are all tetrapods, and even the limbless snakes are tetrapods by descent.

Wings of a chicken are also considered as limb. All the vertebrate animals that have “four” limbs are called as “tetrapods” and these include mammals, birds (like chicken), reptiles, and amphibians. Therefore, chicken is a tetrapod.

Tetrapods are a group of vertebrates that includes amphibians, reptiles, birds, and mammals. One of the key characteristics of tetrapods is that they have four limbs or, if they lack four limbs, their ancestors had four limbs.