Which photograph illustrates competition?
a)
b)
c)
d)

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?

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