Answer
At week 5-6 of gestation, the baby’s heart starts beating.
Explanation
Fertilization occurs in week 3 followed by implantation in week 4.In week 5 the levels of hormones increases with formation of the baby’s heart and circulation system. In week 6, the neutral tube closes followed by development of structures necessary to form eyes and ears. The head of the baby develops at week 7 followed by nose in week 8 and toes in week 9.
They are prokyartic cells
Enzyme speed up chemical reaction by lowering activation rates
The correct answer is: B. Fungus X is a common mold, and fungus Y is a chytrid.
A mold is a fungus that grows in the form of multicellular filaments called hyphae which form a network known as a mycelium. This group of fungi is important in biotechnology and food science (for example production of foods, beverages, antibiotics, pharmaceuticals and enzymes).
Chytrid ("little pot") refers to group of fungi with chitin cell walls, a posterior flagellum and absorptive nutrition. They reproduce with zoospores (motile asexual spores).