A pandemic disease would be the most probable cause of the decrease on the genetic variation of the human population. This is because cellular metabolism and reproduction might become impossible when a particular pathogen affects a particular organism.
The roundworm body cavity is pseudocoelomic, whereas the planarian body cavity is acoelomic.
Answer:
a) A successful organism can find food, escape predators, and reproduce.
Explanation:
- Evolution is defined as genetic changes in population of organisms through time that lead to differences among them.
- To evolve successfully, an organism has to survive and pass down its genetic material to its progeny.
- All these conditions will be fulfilled only when organism will find food and escape predators to ensure survival.
- Thus, an evolutionarily successful organism can find food escape predators and reproduce.
The answer to your question is Sclerenchyma cells have thick lignified secondary walls. Answer: Sclerenchyma