The eyes open and close at weeks

Mother can feel the movements of the fetus at week

If a fetus makes it to _____ weeks, most survive with assistance after delivery.

The fetus is fully developed at

A flatworm reproduces by

A sea star reproduces by

The platypus and echidna are

The kangaroo, opossum, wombats are

Humans, dogs, bats, horses, zebras are

Chickens, humans, reptiles, mammals, and SOME fish have

Amphibians, frogs, clown fish, and some fish use

A zygote has ________ chromosomes

Sperm cells have _______chromosomes

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