Around 40 weeks is when it occurs
Answer:
Observers ahead of the wave observe an apparent increase in wave frequency
Explanation:
This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.
B, C, and D are wrong. Observers behind the source notice a decrease in frequency.
Answer:
Answer is D
Explanation: Experiments in food industry have demonstrated that <u><em>Clostridium botulinum</em></u> spores are highly resistant to radiation, so then <em><u>Clostridium botilinum</u></em> in canned food,must be controlled by high temperatures (around 120 Celsius degrees)or acid pH (lower than 4,7) in canned food.
It has to be c since they are growing