Answer:
19-22 days after fertilization of egg by sperm
Explanation:
The heart is the first organ to be formed in a developing embryo. This is because it is a vital organ and responsible for the circulation of blood (with oxygen and nutrients) to the other developing tissues. It begins to be formed at around 18 days from fertilization and begins to function after day 21.
Answer:
B. 5
Explanation:
5 Although neither enzyme has its maximum catalyzing rate at 5, they are equal in their rate of catalyzing ability at this pH. Pepsin has an optimal pH of 3 while trypsin has an optimal pH of 8.
The earth's rotation influences the global circulation pattern set up by uneven heating by breaking two circulation cells into four cells. The correct answer is D. <span />
The answer to this question is D. because it needs a combination of both types of economies
Answer:
In 1831, Darwin embarked on a voyage aboard a ship of the British Royal Navy, the HMS Beagle, employed as a naturalist. ... Darwin's analysis of the plants and animals he gathered led him to question how species form and change over time. This work convinced him of the insight that he is most famous for—natural selection
Explanation:
