Which of the examples shows a response to a stimulus?

The cluster of developing cells from conception until birth is called an

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Im inn a ! what"s the answer which of the following is one way creativity can scientists? by ensuring they follow the scientific method by increasing the amount of time it takes to complete scientific experiments by making sure they only try things that have already been proven by leading them to ask more questions about the natural world