One way that ecologists characterize an ecosystem is through a transect: a path along which occurrences of a species, or abiotic features of an ecosystem, are measured. The figure below illustrates a transect across a sand dune ecosystem.
B
In this transect, soil was analyzed at sites A. B. and C. The results are shown in the table below.
Sampling site along transect
A
B
C
% humus
0.3
5.4 16.2
(dead plant material)
Nitrate concentration 27.6 63.8 165.6
(parts per million)
Number of soil bacteria 158.4 241.7 783.6
per gram of soil (10%)
a) Describe the difference in the percentage of humus at sites A and C. Explain the causes of this difference.
b) Use the data in the table to describe the difference in nitrate concentration between sites A and C. Explain the causes of this
difference.
c) An ecology student predicted that ar sites A and B legumes will grow better than non-legumes. Explain how the results
support this prediction.

In which process is oxygen absorbed by an organism asap apex

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?