Evolution Test
The first life on Earth was only able to survive because
Oxygen built up in the atmosphere so photosynthesis and cellular respiration could occur.
No large predators were around to hunt small organisms.
The terrain and temperature less volatile and cooler, able to support life.
O All of the above

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

multiplying and dividing the two decimals and the eqations by the same number of the overalls

cell/ tissue/ organ/ organ system/ body

segmented body, an exoskeleton made from chitin, and joint appendages.