Animals consume plant protein, digest it using specific enzymes and absorb the free amino acids. This is when bacteria in the soil convert the nitrate back into nitrogen gas which then gets ...

This is often apparent in animals that use external fertilization. In aquatic animals that release their gametes into the water, animals that release the largest amount of sperm, and sperm that ...

Unlike mammals, birds lay eggs and initial stages of development occur outside the mother’s body ... Ovulation occurs when the follicle ruptures and releases the ovum into the body cavity.

Could it be that one of only three known markers directly targeting the DNA does not exist outside the realm of microbes? Now ...

The earliest days after fertilization, once a sperm cell meets ... organism fascinates scientists across disciplines. For some animals, the entire process of cellular multiplication, generation ...

Some flowers use wind, some water, some protect their seeds in fruit which animals eat. Then, eh…scatter later. Some seeds stick to animals and some are shot out by the flower. Non flowering ...

These programmable models mimic early developmental stages and allow scientists ... The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific mystery. The ...

If a few spermatogonial stem cells remain, it may be possible for them to generate spermatogenesis to haploid stages of differentiation or even mature spermatozoa, provided a suitable environment ...

In late summer, they leave the water to pupate in nearby damp soil. Once transformed into adults, they remain buried, returning to the water in spring. Other animals spend their larval stages in ponds ...