All elements of a ecosystem work together, the sun provides sun light which plants use photosynthesis for food. Small animals eat the producers aka the plants. Then other animals eat those. And so on if a plant wasn't alive then the whole ecosystem will fail.
Pesticides may end up in water sources (such as rivers and the sea), as a consequence they end up in the food chain. Not only this, human water systems could be affected, resulting in humans ingesting these pesticides.
Pesticide presence increases as you go up the food chain because more food will be consumed (e.g: The larger fish may eat several small fish who are contaminated with the pesticide).
Example:
Algae (absorbs pesticide)—> small fish —> Larger fish —> Human
Hope that helped <3
Replication forkThe process by which DNA make copies of itself during cell
division is known as DNA replication. During DNA replication, the double helix
structure of DNA molecule is unzip by helicase enzyme which break the hydrogen
bond holding the complementary DNA base together. However, the separation of
the DNA strands will create Y shape called replication fork. Replication fork
will acts as template for creating new strands of DNA.
If the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume. When this happens, the cell must divide into smaller cells with favorable surface area/volume ratios, or cease to function. That is why cells are so small.
simpler answer: Cells are small because they need to keep a surface area to volume ratio that allows for appropriate intake of nutrients while being able to eliminate the cells waste.
The microvillus are tiny hair- like membrane that greatly increase the amount of surface area of the cells for better reception. It plays a major role in the tongue that are responsible for sending signals to the brain which then decides the taste of the food particle that is on the tongue.
The long and slender structure gives greater space for absorbing the data and then convert them into signals. Hence the microvillus are the slender projections on the tips of some taste bud cells that extend into the taste pores
