All the wild animals and plants were the same as today, what was missing were the domesticated versions (wolves but not dogs, grasses but not wheat, corn or rice).
What is now missing is those animals driven to extinction (dodos, mammoths, passenger pigeons, etc).
Well, most of the time geologists find fossils of plants and animals, and then study them to find out how long ago the plant(or animal) lived.
fossils
Caveman or neanderthal
Yes, during the Cretaceous period hundreds of species other than tyrannosaurus rex lived and thrived.
A typical day for a Neanderthal likely involved activities such as hunting for food, gathering plants, making tools and weapons, building shelters, and taking care of their families. They would have spent a significant amount of time engaging in these tasks to ensure their survival in their environment.
I'm not sure about plants, but animals that lived at the same time as the saber toothed cat would be: Terror birds, early humans, woolly mammoths, woolly rhiocerous. ~ ~Sleenky
Different animals
it wold get allused up and would take a long time to come back
If plants and animals lived forever, the nitrates in Earth's soil would continue to cycle through the ecosystem indefinitely. Nitrates are essential for plant growth and are constantly recycled by decomposers breaking down dead matter. Without the natural turnover of plants and animals, nitrates may become more abundant over time, potentially leading to nutrient imbalances in the soil.
Fossil fuels such as coal, oil, and natural gas are made from organisms that lived millions of years ago. These resources formed from the remains of ancient plants and animals that were buried and subjected to heat and pressure over time.
Coal, oil, and gas are fossil fuels that are formed from the remains of ancient plants and animals that lived millions of years ago. They were buried over time and subjected to heat and pressure, transforming them into the energy-rich resources we use today.
Other animals that lived at the same time as dinosaurs include early mammals and birds, pterosaurs, plesiosaurs, sharks, ichthyosaurs, and mosasaurs. Plants include conifers, cycads, ferns, seed ferns, horsetails, gingkoes, and mosses, and flowering plants came on the scene toward the end of the Mesozoic.