Q: Q: What are chemical messengers that control sexual development and reproduction? Read this paragraph and choose the correct option from the provided answers: Sex hormones are chemical messengers that control sexual development and reproduction. The male reproductive system consists of structures that produce male gametes called sperm and secrete the male sex hormone testosterone. Choices: - lipids - proteins - neurotransmitters - sex hormones A:
A: sex hormones

Q: Q: What is the outer layer of skin, consisting almost entirely of epithelial cells? Read this paragraph and choose the correct option from the provided answers: The epidermis is the outer layer of skin, consisting of epithelial cells and little else (see Figure below ). For example, there are no nerve endings or blood vessels in the epidermis. The innermost cells of the epidermis are continuously dividing through mitosis to form new cells. The newly formed cells move up through the epidermis toward the skin surface, while producing a tough, fibrous protein called keratin. The cells become filled with keratin and die by the time they reach the surface, where they form a protective, waterproof layer called the stratum corneum. The dead cells are gradually shed from the surface of the skin and replaced by other cells. Choices: - hypodermis - connective tissue - dermis - epidermis A:
A: epidermis

Q: Q: What is a feature that prokaryotes lack? Read this paragraph and choose the correct option from the provided answers: No doubt you've had a sore throat before, and you've probably eaten cheese or yogurt. If so, then you've already encountered the amazing world of prokaryotes. Prokaryotes are single-celled organisms that lack a nucleus. They also lack other membrane-bound organelles. Prokaryotes are tiny. They can only be viewed with a microscope (see Figure below ). But they are the most numerous organisms on Earth. Without them, the world would be a very different place. Choices: - epidermis - cell wall - plasma - nucleus A:
A: nucleus

Q: Q: What branch of science is the study of the solid earth? Read this paragraph and choose the correct option from the provided answers: Geology is the study of the solid Earth. Geologists study how rocks and minerals form. The way mountains rise up is part of geology. The way mountains erode away is another part. Geologists also study fossils and Earth's history. There are many other branches of geology. There is so much to know about our home planet that most geologists become specialists in one area. For example, a mineralogist studies minerals ( Figure below ). Choices: - palentology - ecology - biology - geology A:
A: geology