Answer:
Both species will benefit from each other. It is a +/+ interaction.
This type of transport is called active transport
Answer:
D) homologous pairs of chromosomes form tetrads
Explanation:
During prophase I, the homologous chromosomes condense and become visible as the x shape we know, pair up to form a tetrad, and exchange genetic material by crossing over.

velocity is a vector so it has a magnitude and direction so the answer would be B
An undifferentiated cell of a multicellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.