### cell | gamete | ovum | egg:

Amniotic egg
* are born from mammals birds and reptiles.
* grow inside an amniote and are made of calcium that is leathery.
* permits groups of vertebrates known as amniotes to live in dry terrestrial habitats.

Amphibian egg
* are soft and jelly-like and like the amphibians themselves, dry out easily.
* lack a shell and dehydrate quickly in dry air.
* make excellent subjects for observation.

Brown egg
* are laid by a different breed of hen than white eggs, that's all
  - lower in cholesterol than the common white egg
  - more nutritious than white eggs
  - usually more expensive because the hens are bigger and consume more food
* take on a dull almost greenish hue when exposed to bright light for any length of time.

Cold egg
* are easier to separate than room temperature eggs.
* separate more easily than room temperature ones.

Dinosaur egg
* are preserved in a variety of shapes.
* come in many shapes and sizes from cannonballs to giant footballs.
* have hard shells to protect the babies on land.

Duck egg
* are larger, more oily, and tougher than chicken eggs
  - often almost twice the size of chicken eggs
* have a sturdy shell suitable for carving and decorating.

Egg donation
* has some advantages over adoption.
* is one of the most successful measures in treating infertility.
* life-affirming gift from one woman to another.
* medical treatment that requires the giving and receiving of a very personal gift.
* require a semi-surgical procedure that requires weeks of hormonal injections.
* simple medical procedure.
* uses the male partner's sperm to fertilize eggs donated by another woman.

Few egg
* are produced since eggs and sperms are in a confined space.
* survive in warm water.

Fish egg
* are kind of rubbery and they survive being scraped off just fine
  - sensitive to environmental toxicants
  - soft, which is fine under water
  - very sensitive to poor water quality
  - without a shell and are deposited in water
* die if they are smothered in silt.
* hatch into little fish.

Flea egg
* are laid on the host or are deposited on the floor or ground
  - oval, slightly opalescent and about the size of a grain of salt
  - removed from carpets easier than larvae
  - small and white
  - smooth, whitish and oval and readily fall from the pet to the floor or ground
* look like tiny white sand grains.
* represent about one-half of the entire flea population present in an average home.

Immature egg
* appear much smaller and remain opaque following hormone injection.
* are called oocytes.

Insect egg
* Many insect eggs develop by nuclear division without cell membranes.
* Most insect eggs have a coating to protect the embryo from desiccation.
* are known as centrolecithal eggs, for the yolk is collected in the center
  - relatively bulky, with a high content of nutritive material called vitellus
  - therefore similar to the seeds of plants
+ Syncytium, Examples: Cell biology

Large egg
* can be a factor, as opposed to small.
* have difficulty hatching, and small eggs often produce chicks that are too small to live.

Mosquito egg
* can lie dormant for years without water
  - remain domant for a long time without contact to water
* can survive for more than five years
  - years in dry conditions and hatch during rainfall
  - in a dried state for years before being reactivated by water
* hatch only in water.