Solve these clues to fill the grid.
- One of usually two organs that produce ova and secrete estrogen and progesterone
- 3 Across
- The science of matter
- 4 Across
- The secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has (plural)
- 10 Across
- The passage between the pharynx and the stomach
- 11 Across
- The sequence of events involved in the ___ development of a species or taxonomic group
- 12 Across
- The remains of a plant or animal that existed in a past geological age and that has been excavated (plural)
- 14 Across
- The longest part of the alimentary canal
- 15 Across
- Either of two bean-shaped excretory organs that filter wastes from the blood and excrete them (plural)
- 16 Across
- Either of two saclike respiratory organs in the chest of vertebrates (plural)
- 1 Down
- Any of the ___ that deal with the ___ or its parts
- 2 Down
- The process of generating offspring
- 5 Down
- The sun with the celestial bodies that revolve around it in its gravitational field
- 6 Down
- The point of connection between two bones or elements of a skeleton (plural)
- 7 Down
- The branch of biology that studies heredity and variation in organisms
- 8 Down
- Food and nutrients the body needs to grow
- 9 Down
- A cell that is specialized to conduct nerve impulses (plural)
- 13 Down
