Answer:
An experiment in which only one variable is manipulated at a time is called a <u>controlled</u> experiment.
Explanation:
Answer:
6.7 to 7.0
Explanation:
In the digestive systems of humans and many other mammals, an alpha-amylase called ptyalin is produced by the salivary glands, whereas pancreatic amylase is secreted by the pancreas into the small intestine. The optimum pH of alpha-amylase is 6.7–7.0.
<span>A) Abdominopelvic and abdominal
Operation on the intestine wouldn't have to open thoracic cavities since the intestine located in the abdomen and near pelvic. Pericardial cavity is also located near thoracic cavity and it's opened on heart surgeries.</span>
Answer:
Plant respiration
Explanation:
Trees absorb carbon dioxide through photosynthesis and release it through respiration.
