Freddie is 8 months old and weighs 9 kilograms. He needs about ______ grams of protein per day.
What will be an ideal response?
11
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What is meant by the statement "Enzymes are biological catalysts"?
a. Enzymes speed up the chemical reactions in living cells. b. Enzymes are products of biological systems. c. Enzymes produce biological organisms. d. Enzymes produce products useful for biology.
The sudden loss of which organism would necessarily cause the loss of most or all of a food web?
A) producer B) secondary consumer C) mutualistic species D) keystone species
When a honey bee scout returns to the hive, it will perform a round dance to indicate that the nectar is close, while the
waggle dance indicates the nectar is distant to the hive. This dance is an example of: a. sign stimuli linked to social interaction. b. migratory behavior stimulated by environmental changes. c. insight learning based on trial and error. d. a physiologically meaningful stimulus (food) and an irrelevant stimulus (dance). e. optimal foraging dependent on cooperative social behavior.
What part of the lymphatic system interacts with antigens and microorganisms that enter the body through mucous membranes?
a. lymph nodes b. spleen c. MALT d. thymus