Answer:
The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
Alveoli are tiny sacs which form the site of gas exchange in the lungs.
The features of alveoli which help in gas exchange are:
- They increase the surface area in the lungs thus, more space is available for gas exchange.
- They have very thin walls, as thin as the thickness of a single cell only.
- They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.
The process whereby heat flows by means of molecular collisions is referred to as <u>conduction</u>.
Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more readily in solids and liquids, where the particles are closer together than in gases, where particles are further apart.
Because in conduction molecules are closely packed. When one molecule is heated, it vibrates higher than lower energized molecules or the lower temperature molecules and collide with and finally transfer some energy to them.
The rate of energy transfer by conduction is higher when there is a large temperature difference between the substances that are in contact.
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A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. Gene flow is any movement of genes from one population<span> to another and is an important source of genetic </span>variation<span>. Sex can </span>introduce<span> new gene combinations </span>into a population<span>.</span>
Answer:
A. could grown as tall as modern humans
Explanation:
The Nariokotome boy is the most complete fossil of an early hominid ever found. This have gave an opportunity for very detailed and accurate examination of this Homo ergaster specimen. The age of dying of the Homo ergaster boy is still debatable, ranging from 8 to 11 years of age. This boy is tall 160 cm, and it is thought that the growth would have been slightly quicker than that of the Homo sapiens, but slower than that of the chimpanzees, so it estimated that it would have reached full growth by the age of 14. Also, it is believed that the approximate height that this Homo ergaster boy would have reached is 185 cm, making it as tall as the modern day humans, or even taller than the majority of the humans in the present.
Answer:
i think is D water pollution, logging and mining