Group or class of invertebrates. I suggest go for arachnids as they are the largest and most diverse class.
Their respiration, arachnids have an open respiratory system, with most of them having book lungs that are highly supplied with vessels, like the scorpions or spiders. Some arachnids have open pores. Both systems are adapted to breathe even in conditions with low oxygen, such as underground burrows where most of them live.
Blood circulation, arachnids don't have blood or hearts. Instead they have hemolymphs, which freely circulate in body cavities.
Temperature regulation, no bodily functions. Instead they rely on their behavior to adapt to the environment. Arachnids hide under burrows when it is too hot or move to dry places when they are cold.
Development, they undergo incomplete metamorphosis. They mostly hatch in eggs as miniature versions of the adult form, then molt their exoskeleton over time.
Digestion, their digestive systems are simple, with a tube gut. Some arachnids have venom that also act as digestive enzymes, which break down food before they are absorbed by them, like some spider species.
For reproduction, they produce sexually but vary across different species. Some male spiders and scorpions have modified legs and organs that act to transfer sperm. The females mostly have egg sacs that can number to hundreds or even thousands of eggs. Some however only produce a small number of eggs.
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Group or class of invertebrates. I suggest go for arachnids as they are the largest and most diverse class.
Their respiration, arachnids have an open respiratory system, with most of them having book lungs that are highly supplied with vessels, like the scorpions or spiders. Some arachnids have open pores. Both systems are adapted to breathe even in conditions with low oxygen, such as underground burrows where most of them live.
Blood circulation, arachnids don't have blood or hearts. Instead they have hemolymphs, which freely circulate in body cavities.
Temperature regulation, no bodily functions. Instead they rely on their behavior to adapt to the environment. Arachnids hide under burrows when it is too hot or move to dry places when they are cold.
Development, they undergo incomplete metamorphosis. They mostly hatch in eggs as miniature versions of the adult form, then molt their exoskeleton over time.
Digestion, their digestive systems are simple, with a tube gut. Some arachnids have venom that also act as digestive enzymes, which break down food before they are absorbed by them, like some spider species.
For reproduction, they produce sexually but vary across different species. Some male spiders and scorpions have modified legs and organs that act to transfer sperm. The females mostly have egg sacs that can number to hundreds or even thousands of eggs. Some however only produce a small number of eggs.