That modern humans evolved directly from modern apes.
This is quite incorrect because both modern humans and apes evolved from a common ancestor - the most recent common ancestor was between 5 and 7 million years ago. Each followed its own path of development, both becoming more complex over time but in their own ways.
The evolution of single-celled organisms is estimated to have occurred around 3.5 billion years ago, while the evolution of multicellular organisms is believed to have started around 600 million years ago. This means there was a gap of about 2.9 billion years between the evolution of single-celled and multicellular organisms.
2.5 billion years
A relationship between instances of a single entity type is called a self-relationship or recursive relationship. This type of relationship occurs when an entity is related to other instances of the same entity type within the same entity set.
pair. In the analogy presented, the relationship between "one" and "single" is that of singularity, or being alone. Similarly, the relationship between "two" and "pair" is that of duality, or being together in a set of two.
Within a life cycle, a cnidarian transitioning between a polyp and a medusa is not evolution. Evolution happens over many generations, not within a single one. How the two forms evolved to both take place within a single life cycle is not well understood.
Correlation
This is too broad to answer. Every single person has different relationships with every other single person. Please ask your question again in a more specific way -- "What is the relationship between X and Y?" for example.
Mutualism
food web
The law of machine in single purchase crab can be described by the relationship between the effort required and the load lifted.
Marilyn Bailey has written: 'Single-parent families' -- subject(s): Children of single parents, Family life, Juvenile literature, Single-parent families 'Evolution' -- subject(s): Evolution, Evolution (Biology), Juvenile literature
A single preposition is a stand-alone preposition that expresses a relationship between objects or elements in a sentence. It typically consists of a single word like "in," "on," or "by" and functions to show the connection between a noun or pronoun and other words in a sentence.