13. lichens and mosses are the first organisms to grow
in an area. over time, grasses and shrubs will grow
where these organisms have been. the grasses and
shrubs are able to grow in the area because the lichens
and mosses
a. synthesize food needed by producers in the area
b. are at the beginning of every food chain in a
community
make the environment suitable for complex plants
(d. provide the enzymes needed for plant growth

B. are at the beginning of every food chain in a

community

make the environment suitable for complex plants

b because they naturally adapt to their environment plz mark brainliest

explanation:

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.