Answer:
between 300 and 360 million years
Explanation:
Insects took to the empty skies sometime between 300 and 360 million years ago, long before birds, bats or pterosaurs. Wings allowed them to conquer new habitats and ecological niches, and Insecta quickly established themselves as one of the most diverse and successful animal classes, a position they still hold today
<span>The answer should be Avoiding flexion of the neck with use of a cervical collar
Rotating neck will disrupt the vein that carries blood from the brain. Hip flexion will increase the pressure of abdomen and thorax region, makes more blood flow into the brain. If the head using a pillow, the blood flow will decreases as the head has higher potential energy than the heart.</span>
Cnidarians uses arm-like parts called <u>tentacles</u> to sting.
Explanation:
Animals belonging to genus Cnidaria use arm-like structures called tentacles to sting. The cnidarians tentacles are present with specialized stinging cells called cnidocytes.
These cnidocytes are responsible for the stinging action which is done by the cnidocyte organelle called the nematocysts or the stingers.
Nemotocyts contain coiled thread or barb-like or hair-like structures which fires the toxin out while stinging.
The opening or the mouth-like parts on the tentacles contain numerous cnidocytes which releases toxin when the tentacles are touched by another organism or when the cnindarian touches its prey.
Answer: A
Why? It doesn’t kill all living animals(might kill some). No acid rain, and may cause extinction of plants but not most plants. So it has to be A
The Hydroxyl group has solubility water.