Answer:
Fossilized stromatolites resemble structures formed by bacterial communities that are found today in some warm, shallow, salty bays.
Explanation:
Stromatolites are laminated organo-sedimented calcareous structures formed by bacterias and other microorganisms, that are agglutinated due to diverse minerals such as calcium carbonate. They grow attached to a substrate and emerge vertically from it. Because of their rocky structure, stromatolites have the potential to persist as a fossil. Most fossilized cells were found in these rocks at the seashore. Fossil registers show that similar structured have been inhabiting earth since about <u>3.500 and 3.800 millions of years</u>, and they have maintained their evolutive line to the actuality. In the present, they can grow in many places in the world, and they can also be found in certain places with extreme conditions.
Stromatolites are the most ancient evidence of life on earth, being the first atmosphere oxygenators.
Answer:
ai) P= Red blood cell Q= Alveoli
ii)1. It gives the lungs a large surface area to volume ratio.
2. It is moist and thin.
b) P has a disc or biconcave shape which allows the O2 to bind to it with the help of a protein called haemoglobin for it to be transferred to various parts of the body.
c) Carbon monoxide will bind to the haemoglobin to form carboxyhaemoglobin causing oxygen disruption
The first one is solids since they have no kinetic energy
The second one is chemical since the change of colors shows that there is about to be a chemical change
The third one is C
The Endothermic process definitely fits melting
Answer:
1aNeon
b. positive charge.
c. As atomic number is equal to no. of protons and no. of electron and atomic number 10 element is Neon.
Positive charge as it have lost one of it's electron.
Atomic number = no. of protons = no. of electron and since electron can be shared loose or gain to develop charge it have loose on electron.
2a. 4 protons
b. 2 electrons
c. In question 2(a) the atomic number of Be is 4 so it would have four protons.
And as for question (b) it is said it have 2 charge which means positive charge would mean that it have lost 2 electrons and is left with 2 electrons which fulfill it's duplet configuration.
Photosynthesis produces oxygen gas by the reaction of sunlight and carbon dioxide. Every living thing living in an ecosystem requires oxygen to breathe and to survive.
