Social fish may not hold territories but they do jockey for position in the group, and a certain amount of chasing and aggressive display is normal. But if the group is sufficiently large and contains a good balance of males and females, schooling fish shouldn’t cause one another serious harm.
Cichlid fish are the classic examples of territorial fish. Territories may be used to control access to food, to impress females, or as safe places to rear young. Problems occur when there isn’t enough space for both territory holders and the other fish in the community. Unable to leave the aggressive fish’s territory, the other fish end up being harassed, damaged, even killed.
<u>Mucins</u> are water-soluble, complex glycoproteins that are secreted by goblet cells.
Explanation:
Goblet cells, named after their goblet-like shape, are usually found in the epithelium of respiratory and intestinal tracts in the body. Their main function is to produce mucus (primarily made up of mucins), a slippery combination of proteins, water and sugars, that serves three main functions:
- The barrier function: By trapping the unwanted/harmful particles that we inhale and preventing them from entering our system.
- The protection function: By keeping the hair-like cilia lubricated and moist to remove the harmful particles.
- The defence function: Mucus is made up of certain enzymes, antibodies and proteins that act as a defence mechanism for the body.
A unique property of mucins is their capability to form gels - sticky and viscous substances that work both as lubricants as well as defensive chemical barriers in the body.
Answer:
In passive transport, molecules move with the concentraction gradient.
Explanation:
If molecules moved against it would be active transport.
The Calvin cycle is called the dark cycle because it does not require
light to proceed. Unlike light reactions, the Calvin cycle is a
light-independent reaction, which means it can and will occur in the
dark as well as the light. The Calvin cycle is called the dark cycle
because it does not require light to proceed.
hope this helps :p