Answer:
There are four classes of macromolecules (polysaccharides or carbohydrates, triglycerides or lipids, polypeptides or proteins, and nucleic acids such as DNA & RNA). Carbohydrates and lipids are made of only carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, and nitrogen (CHON).
Answer: all cacti in the area.
Explanation:
Population is the total number of organisms of the same specie present in an given area.
Based on the given area (desert), all the cacti, best describes population.
Note that whenever different species (lizards, owl etc) are considered like in options B, C and D, you are referring to a community
Thus, all cacti in the area are considered as population.
Cell membrane is the largest. Most important. Of course all cells are different and shape size also. they all have difference.
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.
