Are there any species that you know of that are now extinct? How might the world be different if they still existed on Earth?

the pinta giant tortoise

the ecosystem would be healthier in the area they come from

Explanation:

giant tortoises perform many critical roles in shaping healthy ecosystems, such as dispersing seeds of native plants and creating open pathways where other animals and plants can thrive.

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the correct option is option a

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.