A scientist planted four plants of the same species in different types of soil. He put two plants in a sunny spot and two plants in a shady area. The plants in the sunny
spot grew much faster than the plants in the shade. He concluded that sunlight has a
large effect on the rate of plant growth. What could the scientists do to strengthen
this conclusion?

He could decrease the number plants used in the experiment

He could use only one type of soil in the experiment

He could place all the experimental plants outside

He could place all the experimental plants in sunny spots

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.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: