Which of the following statements about secondary succession is true? a. Secondary succession occurs in ecosystems that have no vegetation.
b. Secondary succession affects ecosystems that are already established.
c. Ecosystems require pioneer species to undergo secondary succession.
d. Secondary succession can occur in areas without soil.

Edgenuity2020

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a