It is mostly likely the cell membrane.
The cell membrane is a structure of a cell composed of double layer of lipids and proteins. It surrounds a cell and separates the cytoplasm from its surrounding environment. The cell membrane is selectively permeable (semi-permeable), which means that it only lets certain molecules enter and exit. It can also control the amount of some substances that go into or out of the cell.
I would select collecting fossil evidence from the South American and African plates to compare to see if there are similar fossils that could indicate if these two plates/continents were at one time joined together before the break-up of Gondwanaland.
Antibiotics, are helpful for treating the common cold, however due to them being very powerful medicine, they are not highly recommended.
The ideal data representation to display average sales of product per month across six countries is BAR GRAPH, because it's easy to compare sets of data between different group at a glance. they are effective in presenting trends or changes over time and the relationship of the data between the x and y axes is easy to see.
A trophic level is each step in a food chain that demonstrates the transfer of energy.
A trophic level is any feeding level in a food chain through which energy in the form of food is transferred in an ecosystem. A food chain contains five main trophic levels which are; (i) primary producers (autotrophs; plants and algae), (ii) primary consumers (herbivores), (iii) Secondary consumers (carnivores and omnivores), (iv) Tertiary consumers (carnivores and omnivores) and (v) Apex predators.
