Problem 2: Leopard Frogs. A biologist nets 40 leopard frogs from a local pond, tags them with a microchip, and releases them unharmed. A week later, she nets 65 frogs from the same pond, including 26 with tags. Based on the Lincoln−Peterson index, estimate the number of leopard frogs in the pond.

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1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.