Frog temperature. Frogs are ectotherms, this means they gettheir heat from external sources. They are sometimes called 'cold blooded', but in fact they do not have cold blood, it is justregulated by their environment. In comparison, humans are endotherms and can maintain their body temperature at about 37°C.
Explanation:
The pulmonary valve (sometimes referred to as the pulmonic valve) is a valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps. It is one of the four valves of the heart and one of the two semilunar valves, the other being the aortic valve. Similar to the aortic valve, the pulmonary valve opens in ventricular systole, when the pressure in the right ventricle rises above the pressure in the pulmonary artery. At the end of ventricular systole, when the pressure in the right ventricle falls rapidly, the pressure in the pulmonary artery will close the pulmonary valve.
Sugars move down to the roots<span> and </span>water<span>-nutrients move up to </span>leaves Xylem<span> and </span>phloem<span> make up the big </span>transportation<span> system of </span>vascular plants<span>. As you get bigger, it is </span>more<span> difficult to </span>transport<span> nutrients,</span>water, and sugars around your body. You have a circulatory system if you want to keep growing. Asplants<span> evolved to ...</span>
Asexual reproduction like bacteria
