Answer:
365 million years ago
Explanation:
The tetrapods are a super-family which includes all living and extinct vertebrates that have walked and are still walking the Earth, including the mammals, reptilians, dinosaurs, sinapsids, pterodactyls, amphibians, birds. They have evolved from fish-like creatures that were living in the shallows, and over the course of millions of years they were slowly changing and adapting to amphibian life, thus partially aquatic, partially terrestrial. The first proper limbs, at least what is know so far from the fossil records, have emerged with the ichthyostega and acoantostega around 365 million years ago. These two species were able to lift their body above the ground with their limbs, support its weight, and walk on them without dragging their body on the ground. The first transitional limbs can be seen in a species that has been dated to around 375 million years ago, the Tiktaalik, which had had limbs, but still not well developed, and it was only able to stand on them while in shallow water, but on on land.
C. This shows that there are some limiting factors to the population's growth.
Answer: prefrontal cortex/reticular activating system
Explanation:
The prefrontal cortex is the part of the frontal lobe of the brain. The function of the prefrontal cortex is to control the planning, motivation, decision making, controls the emotions, behavior and also responsible for the awareness of self and the surrounding.
This region consists of cortical urinary center which controls the urination, anterior and middle arteries which controls the flow of blood. Thus this center is essential for self-awareness.
The reticular activating system can be defined as the system of neuron network. This is located in the brain stem, this is projected anteriorly to the hypothalamus which produce a behavior response. It is also connected to the posteriorly to the thalamus and is responsible for activation of awake in an individual.
True because since there are not many ways for them to erode they can thrive
