1. Which diagram in Figure 1.1 would illustrate the statement below? The forehead is superior to the nose.
2. Which diagram in Figure 1.1 would illustrate the statement below?
The sternal is anterior to the spine.
3. Which diagram in Figure 1.1 would illustrate the statement below?
The heart is posterior to the breastbone.
4. Which diagram in Figure 1.1 would illustrate the statement below?
The elbow is proximal to the wrist.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

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