I use save my exams
https://www.savemyexams.co.uk/gcse-biology-aqa-new/
And I also use past AQA papers but end of topic tests
Hope it helps :)
At High growth rate population the supply of earth expected to be used up the soonest.
<u>Explanation</u>:
High growth of population leads to an exponential increase in the population numbers.
For example, the high growth in a family of 2 will lead to more 2 children and the cycle continues. There is growth in a geometric fashion in multiples of 2 like 2, 4, 8, 16, 32. This will lead to strain on the natural resources and lead to their depletion.
At high rate of population growth the natural resources of Earth are expected to be depleted the fastest.
Answer:
Covalent bonds are formed in the nitrogen gas.
Explanation:
"<em>Nitrogen atoms will </em><em>form three covalent bonds</em><em> (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell</em> (Lumen Learning)."
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for this answer, I would like to say B!
Answer:
The mechanisms of membrane transport are:
1) Simple diffusion: It is the process by which molecules move from a higher concentration to a lower concentration along a concentration gradient.
2) Facilitated diffusion: It is the type of diffusion which occurs with the help of some kind of molecules such as carrier molecules.
3) Active transport: It is the movement of molecules from a lower concentration to a higher concentration against a concentration gradient. Such process often requires energy to occur.
4) Exocytosis: When molecules or ions move out of a cell with the help of vesicles then such a transport is termed as exocytosis.
5) Endocytosis: When molecules or ions move inside a cell through vesicles then such a process is termed as endocytosis.