hydras carry out asexual reproduction (binary fission) whereas mammals carry out sexual reproduction (mating)
Budding
yes mammals do use internal reproduction as they are more likely to survive longer as they are less likely to be eaten.
Both birds and mammals care for their young.
A Hydra is a mythical creature. Hydras aren't real.
They are mammals and have offspring in the same manner as other mammals, by sexual reproduction.
plants are a-sexual reproduction meaning that only one parent is need to make offspring and the offspring is identical to the parent. sexual reproduction is in mammals where two parents are needed to create offspring.
yes, they do
The hydras are gone.
polar bears are internal because they are mammals and all mammals are internal.
Milk is a secretion from modified sweat glands of mammals (Got Milk?) which contains calcium, protein, amino acids, and vitamins and is a source of food for young mammals. Estrogen is a hormone in female mammals produced in the ovaries and is involved in reproduction and lactation. 2 different words!!!!!!
if your talking about what is the difference between mammals and non-mammals, the difference is: the non-mammals lay eggs and the mammals just have baby's out their vagina.. XD
there is not even hydras on clubpenguin