If they test more than one variable, they wouldn't know if it was both variables or one variable that was responsible for any observed effect.
One of the factors that affect natural resistance is nutrition. Malnutrition breaks down the immune functions by suppressing the immune system [1]. ... Balanced nutrition, especially in terms of adequate vitamin, mineral and protein intake, enhances the resistance against infections.
Answer:
a. (i) glomerulus, (ii) a network of capillaries
Explanation:
A pair of the kidney is the main excretory organ in humans. Each kidney made millions of tiny units called nephrons.
Each nephron has a glomerulus. It is tuft (network) of capillaries surrounded by a cuplike structure called Bowman’s capsule.
The network of blood capillaries consists of afferent and efferent arterioles. As blood flows through the glomerulus, the fluid from the capillaries gets filtered by podocytes, a specialised layer of cells, called filtration membrane. This glomerular filtration begins the urine formation process.
Answer:
nucleus, ribosomes
Explanation:
DNA, and the instructions that are used for making proteins are all found in the nucleus. The nucleus witholds the majority of the cell's genetic material. Ribosomes do protein synthesis and are located on the rough endoplasmic reticulum.