Is there something specific about plants and animals? If you are using the NGSS standards, the Wonder of Science is one of the BEST sites for phenomena based science instruction and is aligned to the NGSS standards.
https://thewonderofscience.com/

I love using Mystery Science to get in some daily thinking about Science with discussion or journaling.

We are about to start this STEM process https://a.co/d/2Rajtg8. It takes about three weeks for the caterpillars to grow and turn into butterflies and there is so much to learn through the process!

We do a lot of exploration in first grade.

I teach 4th grade. I play a survival game with my class that I created with our environmental educator. I live in Pennsylvania, so I have the students pick a plant or animal that lives in our state (no pets or zoo animals). Then I name something that happens like a week worth of rain or an eclipse. We discuss whether the animal/plant would survive. If you are interested in a copy of the game, please comment. I also have a research page.