When there is a relationship between two factors it is called a–
a. correlational effect.
b. positive feedback.
c. negative feedback.
d. causal effect.

1. isogamy 1 organisms with gametes of the same size and shape 2. anisogamy organisms with gametes of different sizes and shapes 3. oogamy 2 organisms with gametes of the same shape but different sizes 4. gonads gamete-producing organs in lower plants 5. gametangia gamete-producing organs in animals