Fill the blank:
Vitamin A is found in foods of animal origin.

Preformed vitamin A is found in foods from animal sources, including dairy products, eggs, fish, and organ meats [1,2]. Provitamin A carotenoids are plant pigments that the body converts into vitamin A in the intestine [1,3].

↪Preformed vitamin A is found in foods from animal sources, including dairy products, eggs, fish, and organ meats. Provitamin A carotenoids are plant pigments that the body converts into vitamin A in the intestine

You can also get vitamin A by including good sources of beta-carotene in your diet, as the body can convert this into retinol. The main food sources of beta-carotene are: yellow, red and green (leafy) vegetables, such as spinach, carrots, sweet potatoes and red peppers. yellow fruit, such as mango, papaya and apricots.

Preformed vitamin A is found in animal products such as meat, fish, poultry, and dairy foods. Precursors to vitamin A, also known as provitamin A, are found in plant-based foods such as fruits and vegetables. The most common type of pro-vitamin A is beta-carotene.

Vitamin B12 is found only in foods of animal origin, therefore, vegans (strict vegetarians who consume no animal products) may need to supplement their diets with this vitamin.

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Chemical in the birds foot produces the red coloring.

Explanation:

Hypothesis refers to a statement about particular observation. A hypothesis is tested for its validity through experimentation. The hypothesis about the causes of presence of red feathers in scarlet ibis can by represented by statement "Chemical in the birds foot produces the red coloring". This testable statement tells about possible cause of presence of red feathers in scarlet ibis.