The Sun is the ultimate source of energy for most communities of living things in a food web.
It’s the transcontinental railroad i’m pretty sure
Explanation:
The statistical study of populations and how they change over time is called demography. Two important measures of a population are population size, the number of individuals, and population density, the number of individuals per unit area or volume.
I think it's XAXA and XAXa because x-linked rec. usually is only fully present in males
Amoeba is just1 cell and usually life organizations with 1 cell are not have a routine life and as u know vacuel is for saving water when a amoeba is in lake some times it need more water.