vestigial limbs
vestigial limbs are the remnants from the development of any one organism's ancestors.
Humans, for one example, have no real need for an appendix now that we are no longer herbivores.
Look at a x-ray image of certain snakes and you can see the structural remains of feet.
Answer:
The radii of the arterioles constrict by humoral control and by nervous control.
Explanation:
The vascular system regulation is performed by the smooth muscle of the arterioles, which constitute the maximum resistance point. The smooth muscle relaxation provokes vasodilation, increasing its diameter. On the contrary, smooth muscle contraction provokes a decrease in the arteriole´s diameter, reducing the blood flow.
This muscle is under the control of the autonomous nervous system and certain hormones.
Substances such as adrenaline, noradrelanine, angiotensine, vasopresin, and endotelines cause vasoconstriction.
Also, there are many vasoconstrictor fibers of the sympathetic nerves that increase resistance and modify blood flow.
Answer:
cells, energy and transport, reproduction and cell division, classical genetics, molecular genetics, evolution, human body systems, ecology.
Explanation:
I looked this up and i have a older sister in grade 10, so i'm 100% sure this is right.
Dichotomous key is a tool <span> - a series of questions and choices </span>that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. The first step is observing the whole specimen you want to identify. Observing the habitat in which it is growing,its size and overall shape and some<span> distinguishing features. It is very important to make carefully these observations in order to use the key.</span>
Answer:
they would get harder beaks
Explanation:
the beaks would need to be tougher in order to eat the seeds