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Unformatted text preview: o Need 2 parents Counterproductive if conditions are stable o Only half of population (females) are producing offspring Males are wasting energy o Less efficient at passing on genes – offspring only inherit half ← STDs ← ← zygote – single-cell form ← 4-5 days before embryo attaches to uterine wall ← embryo isn’t connected to mother until implantation (no pregnancy) ← growth, cell replication, differentiation ← amniotic cavity ← amnion ← ___ membrane is unique to mammals 08/01/2007 12:17:00 ← 08/01/2007 12:17:00 ←...
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