Answer: I'd say C
Explanation: Small plants are at the bottom of the ecosystem, which means they have to start it out. I'm not sure tho.
9: Well big groups of birds are often found competing for food, causing fights and even death due to the fight. If a flock of birds from population A goes to population B, there would be more competition due to birds wanting food and nesting places that are good.
10: Many species evolve to suit environmental changes, but let's say this change in the environment was bad. Pollution, species of aggressive animals, which would eat the food the animals need and cause a downgrade in food leaving the area bare, and hunting, which would bring humans to the area and cause them to camp out, eat the animals and wild vegetables, such, can cause negative population changes. Due to these things birds could get sick and die off, causing population to go down. If trash and sewage are not cleaned up it could affect the birds food source and cause it to be bad for a long time, the aggressive animals would kill and eat the birds causing a continuous spiral of death, and hunting could cause them to die.
the answer is B which is a crack in the topmost section of a glacier. I hope you got this right
Answer: B. conjugation
Conjugation is the reproductive stage of bacterial cells wherein a bridge-like structure is form between two bacterial cells that allows the transfer or the transport of genetic material from one cell to the other cell in the form of a plasmid.
Answer:
This is a scientific model .Water from rivers, seas, ponds, lakes, ... evaporates up high, when cold is high, condenses to form small droplets of water (when they stand close together to form different shapes we call clouds), these small droplets fall on the ground creating rain
