The Sun is the primary source of energy for ecosystems. The Sun emits . When an organism obtains nutrients by feeding on other organisms in the ecosystem, energy is used and released. Energy changes form, but it isn’t destroyed as it transforms. This scientific law is called the law of
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the answer to your question is sperm

is this for the e2020 class

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

a symbiotic relationship with the mitochondria