They saw how smoking effected the body since smoking was pushed as something good for a long time, a lot of people started smoking and after a few years doctors finally saw a difference between a smokers body and a non smokers body
Greater body size and facial gracility documented in Homo erectus are likely related to changes in tool technology and increasing access to meat and other proteins. Homo erectus walked just like a modern human, with traits like double arches and adducted big toe, they had a cranial capacity range from 650 cc to 1,200 cc.
The given question says that a student has constructed a model of cellular transport using fences and several gates.
This model can be used to demonstrate the cellular transport.
The gates of the fences can be supposed as the protein pumps and the other fence demonstrates the lipid bilayer.
Let’s suppose in the fence, there are many cattles, and outside, there are less cattles, but the student open the gate and bring more cattles inside the fence. In this case, the transport of the cattles is similar to the active transport of the molecules using protein pumps. At cellular level, the energy for the active transport is provided by ATP molecules.
Now, let’s say, the student wants to feed the cattles with some nutrition rich food, which can help in maintaining the health of the cattles. The student fills his car with the cattle food and he enters inside the fence through gates. In this case, the food was not present in the fence, but was abundant in the outside environment, so, the diffusion would occur. But food cannot come self, without help of others, so, the movement is facilitated by the car, as it is done by the carrier proteins. Hence, it is an example of facilitated diffusion.
Renin enzyme
Renin enzyme are also known as angiotensinogenase and
function by regulating the body means arterial blood pressure. They do circulate
in the blood stream and digest angiotensinogen that was secreted in the liver
into peptide angiotensin 1. Thus, they are secreted by the kidney and placenta.
