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.
Answer:
Biodiversity is important because it boosts an ecosystems productivity where each species, no matter how small, all have an important role to play.
Explanation:
Answer:
The correct answer is option D. a cube.
Explanation:
Epithelium cells are type of cells that has a simple cuboidal epithelium that consists of only a single layer of cells that are cube-like or cuboidal in shape. In the question given cell is similar to these cells.
These cells have large, spherical nuclei present in the center. These cells are cube-shaped cells which support the option D to be correct.
Thus, the correct answer is option D. a cube.
Answer:
eustatic sea level are large scale events: tectonic activity shrinking or growing the area of world oceans, a rise in temperatures causing thermal expansion of water, or large ice sheets melting and adding water to the oceans are the three most common.
Explanation:
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Although the actual questions are missing from your ask, here's how you can tell.
If the study will be messed up (added bias) through interaction with the subjects the study should be observational. For example if a biologists wanted to study the eating habits of wild birds in the tropics, they would need to do an observational study. if they did a controlled experiment, the birds will change their eating habits based on human interaction, thus making the study invalid.
If the study requires specific measurements, close monitoring, or contact and interaction with the subjects the study should be a controlled experiment. For example, if a scientist wanted to test out a new drug, the health of patients would need to be closely monitored.
