Life Science 2014 17 March. Invertebrates are animals that do not have backbones.

GIZO KVARATSKHELIALife Science

2014 17 March

Invertebrates

Invertebrates are animals that do not have backbones

Sponges

Lavra

Sponges

Embryo of Sponge

Spawning of Sponges

Squids

Squid it the nature

Baby of Squid

Embryo of Squid

How they reproduce?

How the embryo develops?

How the young develops?

Do animal take care of their children?

Sponges Sexual-When they release sperm into the water in hope that it will get other spongeAsexual-They are making little clone and it is growingThey are hermaphrodites but they cannot fertilize themselves

The fertilized egg develops in the larva

 they are budding and getting into bigger sizes until they will be enough big to get food in the ocean.

They don't raise their young. They just ensure that they are born into a food rich environment. 

Squids Squid reproduce when the male squid produces a long tube called spermataphores. These spermataphores are filled with millions of sperm. These tubes are deposited in or on the female by a modified arm, that most squid species have. The spermataphore cluster is implanted on the head of the female.

As the embryo grows, the space inside the egg shell enlarges, and the shell itself is stretched and pushed out, away from the embryo, as if this were hollowing out a

place for itself in the surrounding gelatinous matter; but as both the outer and inner surfaces of the egg shell are well marked and clearly visible, there can be no doubt that it is a real membrane, and the albumen of the egg capsule must therefore either be absorbed through it or drawn in through the micro Pyle.

Baby squids are hatched as larvae and grow to maturity from 3 up to 5 years. Squids are a diverse group of invertebrates, with the smallest squid measuring about 2.5cm long. The largest grows up to about 20 meters long. These animals are soft bodied and have two muscular tentacles and 8 powerful arms.

No, they don't

Vertebrates

In comparison with the invertebrates most vertebrates are large and complex organisms whose structure is built up of numerous tissues and organs

Giraffe

Giraffe

Giraffe’s tongue (50cm long)

Giraffe’s child

Giraffe’s Embryo

Shark

Shark’s Embryo

Shark in it’s environment

Shark’s babies

Penguins

Penguin in South Pole

Penguin’s Embryo

Penguins children

How they reproduce?

How the embryo develops?

How the young develops?

Does animal take cares of their children?

Penguin Penguins reproduce like any other bird, the male and female will have an encounter during which her egg will get fertilized. After a short period the egg is released, but unlike most birds, the male is then responsible for protecting the egg.

The egg is incubated, or kept warm, by the father. While the egg is being incubated, the embryo develops. When the egg has been incubated for64 days, a chick hatches from the egg.

When chick is five months old it is left by itself. After molt the chick feathers and grows new ones. After molts the penguin is called fledgling. It is in this process until growing to mature. This needs from four to six years.

Yes, they do. The mother and father of chick are feeding, keeping in warm and defending from the predators him. They don’t take care of him after 5 months and chick will live by itself.

Shark There are three different ways: Oviparity.Sharks lay eggs in the ocean.ViviparityVery much like mammals, sharks have placental links with developing pups, nourish them and keep them until pups born fully functional.OvoviviparityThis is the most common reproduction method among sharks.Eggs develop inside the oviduct of the mother and then hatch inside the oviduct where they finish their development using the remaining egg content to make pups born fully functional.

The development of the embryo in the egg case can be divided into four stages. The temperature of the tank water directly affects the stages of embryo development.The first stage occurs around two to 21 days. In this stage, the embryo is very active and measures 0.06 to 0.1 inches (1.5 to 2.5 mm). It is often hard to visualize in the first few days, as it is a very thin embryo.The second stage occurs around 28 to 35 days. The embryo measures around 1.2 to 2.4 inches (30 to 60 mm) and is not as active in this stage. The end of the egg case develops an open split, which air can enter if the egg case is brought out of the tank.The third stage occurs around 42 to 60 days. The embryos begin looking like adults in shape and markings. The celli, the classic black spot near the gills, is apparent. Embryos are 3.3 to 4.65 inches (85 to 118 mm) in length.The fourth stage occurs around 70 to 90 days. These are “mini adults.

The development of sharks pup is short. It is getting nutrients fro the environment and survives for its own as mother don’t takes care of them. It is very dangerous period when a lot of them don’t survive. There are growing from 12 to 40 feets.

No, they don’t. After hatching they are ready to go on. Sometimes sharks eat there children.

Giraffe Giraffes reproduce through mating like the four legged mammals.

Fertilization takes pale in the womb and the gestation period for giraffes is 14 months, after which they give birth to calves.This process is going in uterus.

A newborn giraffe will suckle its mother’s milk as soon as it can stand up. Calves are reliant on their mother’s milk for up to 9-12 months. Solid food (leaves) can be eaten from about 4 months at which time calves begin to ruminate.

Male calves will leave their mothers at about 15 months and form all-male groups. The female juveniles however don’t leave until they are about 18 months old and stay in the same areas as the family herd they grew up in.

Yes, they are great mothers. Giraffes are with them for all time until 9 months.

Thank you for watching!

Work Cited Page

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