20.4 21.3 are the correct answers
1. Agriculture has to do with farming, cultivating the soil and growing crops, as well as rearing animals to provide food, wool, and other products.
Aquaculture, or aquafarming, has to do with farming of fish, <span>crustaceans, molluscs, aquatic plants, algae, and other aquatic organisms.
2. Recreation has to do with spending leisure time, be it in zoos, aquariums, etc.
3. Biological control has to do with </span><span> controlling pests such as insects, mites, weeds and plant diseases using other organisms, such as parasitoids and pathogens.
4. Genetic conservation </span>applies genetic methods to the conservation and restoration of biodiversity.
Answer:
The immune response is your body's third line of defense. In this response, your body releases B-Cells and T-Cells to fight the antigen and destroy it.
Explanation:
Hope this helps!
In natural selection, there are three main things you need to know. There must be a variance in the genepool of course, or else to selection or evolution will take place. There also must be a selective force and time. Now, lets say that there is a population of many colored moths. But lets say that the brown colored moth blends in with the environment. This means that predators (selective force in this case) will have a much harder time finding these brown moths instead of easily finding some of the other colored moths (variation). This means that the brown moths will survive at a much higher rate because the are harder to find, and over time, the gene pool will narrow down to just brown moths because the rest of the moths die out due to predators and competition. This also means that this moth species has evolved over time to just become the brown colored moths only. Hope you can understand this but feel free to ask for clarification.
Answer:
The flower contains the reproductive parts of the plant that are female part- gynoecium and the male part -androecium. These parts help in reproduction as when the stigma of the gynoecium receives the pollen grains from the anther of androecium part fertilisation takes place and it forms a zygote
Explanation:
