It is either 2 or 3, that’s all i can say sorry if that’s not enough help
Answer: <span>aquatic animals
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External fertilization is the kind of fertilization that happens outside the female body. The female will put the unfertilized egg outside and the male will eject the sperm later.
This will cause the sperm have to mobilize further to the egg than internal fertilization. That makes this method only viable in water or highly moist area.
Genetics is the study of how heritable traits are transmitted from parents to offspring. Humans have long observed that traits tend to be similar in families. It wasn't until the mid-nineteenth century that larger implications of genetic inheritance began to be studied scientifically.