I think d but im not sure
Answer:
Bacteria are essential in cycling the nutrients back into the soil for plants to use, and cycling nitrogen back into the atmosphere. Nitrogen is found everywhere in the world, including animal waste, the atmosphere, and decaying matter.
The net primary productivity is derived from the gross primary productivity, which is a measure of the total amount of light energy that was captured and converted into chemical energy (organic compounds) during Photosynthesis. Plants allocate that biomass (energy) to power their life processes or to store energy.
Answer:
Protein electrophoresis is the process of the analayzing the present proteins in a specific mixture using the polyacrylamide or agarose gel. These gel are acts as the sieve to extract the proteins from the mixture on their character.
This is shows the migration of the protein on their various factors such as size, affinity to gel, and shape of the protein. The smaller the protein more it will move or migrate faster. Affinity t the gel of the method to the protein also affects the distance and sped of migration.
The answer is A, they are connected to all levels.
Decomposers in a food web, such as bacteria or fungi, mainly get their nutrient by decomposing dead organic matter to release carbon dioxide (when they respire)to the air for producers (which are mainly plants).
The following basic food chain (which forms food web when many of these are connected) may help you understand better:
Producer→primary consumer→secondary consumer→tertiary consumer
Since all levels in a food web is formed from organic matter (including plants and animals), decomposers feed on them to get their nutrient, so they're actually connect to all levels.
B is not correct because secondary consumers are the carnivores, which are animals that consume other animals for food and nutrient.
C is not correct because primary consumers are herbivores, which are animals that consume plants (or producers) for food.
D is not correct because autotrophs are organisms that make their own food by themselves, which are usually by photosynthesis (the process to make glucose from light energy). They're usually green plants, and the "producers" from a food web.