The heart begins to beat. 

 Choose the letter of the best match:
A. third trimester of pregnancy
B. second month of pregnancy
C. first month of pregnancy
D. second trimester of pregnancy
E. third month of pregnancy


B. second month of pregnancy

Biology & Microbiology

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Knowing the concentration of microorganisms in a sample is often an important consideration for environmental, industrial, and medical microbiologists, yet a microscope is sometimes not used to accomplish this task

Explain five major limitations to using a light microscope to directly count microorganisms. What will be an ideal response?

Biology & Microbiology

The function of the vascular cambium (a type of meristem) is to:

A. produce new growth at the tip of stems B. produce secondary xylem and phloem C. produce only xylem to make wood D. produce only bark E. produce new leaves

Biology & Microbiology

Platelets in mammals are functionally the same as ____ in other vertebrates

a. neutrophils b. eosinophils c. thrombocytes d. monocytes e. lymphocytes

Biology & Microbiology

These small short-lived organisms have a reproductive strategy to produce many offspring that have fluctuating populations. 

A. r-strategists B. k-strategists C. l-strategists D. s-strategists

Biology & Microbiology