Please help! both need a 3-5 sentence paragraph. Question 1. Within an ecosystem, biotic and abiotic factors interact. 1. Consider a creek running through a meadow in the mountains. what are some of the biotic and abiotic factors of this ecosystem?
Question 2. Now a beaver builds a dam in the creek and the meadow floods, becoming a pond. What do you think will be on the previous meadow and creek ecosystem? How will the biotic and abiotic factors change?

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

How do living things obtain phosphorus

Which organ controls breathing? lungs alveoli heart diaphragm